I wasn't crazy about the 83 and 84s and switched to Casio and Sharp. I bought the 86 when new and the Python only because I had a Staples gift certificate! Still want an 89.
My Mum will give me this 85DE CW for my Birthday and I will get 2 More to have my first Calculator Collection
My birthday is in one month
26 of September getting 21 years old
Bought it at the same price as es plus was selling and I am so happy I chose this
Like to do matrices I just have to select it unlike other calculators where you have to do some combination and all I just have to click few buttons and all
Yes for things like integration it takes a bit more time I do agree that
And for some things like some constant , in old calculators you have to remember which does which but in my you don't have to you select it
Now some will say the constants are mentioned
In the cover of the calculator but the thing is we are not allowed to bring the cover because the teachers think we hide chits in there . Also I really love the dice and coin animation 🤗 in this
I got it for 550,400 VND or about 21 USD (normal price is 688,000 VND)
The Flexio Fx799VN is a high-end scientific calculator produced by Thien Long Group, designed specifically for high school and university students in Vietnam. It is fully approved by the Ministry of Education and Training for use in official national exams, including the National High School Graduation Exam and University Entrance Exams.
Basically a clone of CASIO fx-991EX, but with some improvements. The Vietnamese company behind the calculator even publish the manual both in Vietnamese and English.
Happy to get this calculator, not easy to find outside of Vietnam. It’s the 2025 version, speed is comparable to my new CASIO fx-880BTG PLUS. (Vietnamese version of CASIO fx-991CW 2nd edition) In some benchmarks faster than the CASIO.
It has many functions and features that are missing from fx-991EX and/or the fx-880BTG PLUS:
However, it is missing the Spreadsheet app, that is a big minus.
The manual doesn’t mention what algorithm is used for the integration function. I suspect it’s Simpson’s instead of the better Gauss-Konrod that CASIO is using in its calculators.
No QR code functionality for calculator results.
Accuracy is 15 digits, same as fx-991EX.
Display and font very similar to fx-991EX. The new fx-880BTG PLUS has a font with better contrast.
Ridiculously big FLEXIO logo on the front – needs to be hidden as soon as possible.
Agradezco cualquier información para poder llegar a conseguir estas dos calculadoras desde Uruguay 🇺🇾
La Canon F-789SGA Version II
La GENIE 92SC
From a 82 to a 500. Most 300's and 991's I think. Hold on, I also have a 9750g2 and g3 somewhere. Considering a 50 or 100 now.
It may be hard to see, but one thing that I just noticed that I don't think I've seen mentioned anywhere else is that while working with fractions, only the portion of the fraction that you're editing will be entirely in "bold" and that the rest of the equation will be "greyed out". It's very subtle but thought it was interesting, I've provided a few pictures of the same equation to try and show it (the cursor itself is different shades because of the blinking). It might be more useful in more complex calculations, but I haven't figured that out yet. Lmk if you've known about this or know where this would be useful!
This calculator was purchased quite a few years back but has not been used as much. Today I found the display having these sort of patches (idk how else to describe this) and very difficult to see the numbers.
Can this be cleaned?
Or does LCD need to be replaced?
Or should I buy a new calc altogether? (I use calc occasionally though...)
Assuming a jailbreak for this calculator comes out eventually, will this calculator bring anything new or interesting to the TI gaming community? I'm mostly inquiring about more complex games, such as games you'd need emulators for. Will GBA games be possible on this calc? Or, will there be no noteworthy improvements, and should the insane people who only buy these expensive calculators just to play games on (like myself) skip on purchasing this one?
hola a todos soy nueva en calculo intyegral y necesito ayuda mas que todo para saber si el proceso en general me queda bien y consejos de como hacer los ejercicios mas faciles.
Resultados (no se si me quedo bien)
2/3 x^(3/2) + C
9- 2Ln |x| - cos (x) + C
3x^3 - 5Ln|x| + C
2/3 x^(3/2) - 2/5 x^(5/2) + C
3/13 x^(13/3) - 3/7 x^(7/3) - 6x^(1/3) + C
e^x + x + C
2x^(1/2) + x + 2/3 x^(3/2) + Ln |x| + C
5 Ln |sec(θ) + tan(θ)| -3 Ln |csc(θ) - cot(θ)| + Ln |sin(θ)| + C
4/7 u^(7/2) + 18/5 u^(5/2) + 8/3 u^(3/2) + C
-1/sin(θ) + C
2x - 6 Ln|x| + C
1/r2 arctan x/r2 + C
ACLARO quiero consejos para mejorar en este tipo de ejercicios, ya los resolvi por mi cuenta, no es una tarea, si los quieren usar para practicar ustedes haganlo :))
So I have been downloading some files and stuff on my cg50, which i have newly acquired,but I have found something weird....my casio says I have 5.85 mb free, and after adding up files, I have used about 3.54 mb...but the casio cg50 has a 16 flash memory, and 5.85+3.54 is about 9.39 mb, so where is the remaining 6.6 mb? Can you please help me,its actually making me crazy....ty.
(P.S I searched Google and asked multiple AIs, but it still didn't make sense to me)
I’d picked up an old HP-35 (second version, I think?) from a rummage sale a little while back and was hoping to revive her. The battery pack in it currently has a tiny bit of leakage from one of the cells, so I didn’t want to try to charge it, but otherwise looks to be in pretty good condition. My question is would it be simple enough to pry the original pack open and replace the cells, or would it be easier to just buy a third party pack/adapter?
9200,
531,532,535,540,546,
501,503,510,516,520
Hoping for the best anyway.
Pic #1 I knew that this one was going to have some problems as the seller listed it as a parts calculator, and the blue corrosion on the charging jack pretty much told the story.
Pic #2 The back cover was hot glued down. I was expecting that. And I darn near ruined it getting the cover off.
Pic #3 Looks worse than it really was. I can't see any trace damage, which is amazing in itself.
Pic #4 When I finally got the battery pack out it sent the crud flying.
Pic #5 Getting its first vinegar bath.
Pic #6 All cleaned up, mostly dry (after the vinegar bath came the rinse, and then a quick dip into 91% IPA to dilute the remaining water with alcohol. Let the alcohol evaporate (outdoors) and you are left with very little water.
Kinda hard to tell in this photo but the corners of the board are held down by melted plastic. Sort of an ad-hoc heat staking. Also note the unused octal IC footprint. It's been a minute since I've seen one of those. :)
And the wire that goes from the top of the calculator to the bottom I'm guessing is nichrome wire, and it's being used to limit the charging current to the battery pack (or was since the battery pack is gone).
Pic #7 All cleaned up and ready for the space heater. Still a bit most in this pic, but it spent the night getting dried out in front of a space heater and looks as good as new (cosmetically anyway).
Pic #8 The interior all cleaned up and dried out. You can see where the corners of the board have been melted to hold in the board.
Pic #9 Looks pretty good. :)
A TI-84 Plus calculator was for sale at a local flea market for 25 euros (about 29 USD). I don't really need a calculator like this for anything these days, but as it appeared to be in good condition, I bought it just for the fun of it. At home, I replaced the backup battery, put in new AAA batteries, and gave it a bit of a clean-up. And finally, I also updated the firmware.
I wasn't particularly familiar with the TI-84, so I've spent the last few days getting to know it. What surprised me the most was finding out that it has a Z80 processor. Back in the day, I learned assembly programming on an MSX home computer. And those machines had a Z80 processor.
So, it was fun to write a small Z80 assembly program, transfer it to the TI-84 Plus, and see it work. Truly nostalgic.
I don't know if this is widely known but, to find the hypotenuse using just a calculator, you just click shift and + which turns into Pol() and put your opposite comma adjacent for example: Pol[5(opposite), 15(adjacent)] it'll give you the hypotenuse and if you wanna find the angle in the hyp and adj you can just click RCL and then tan which gives you the angle.
I'm not sure if this is widely known but a cool hack nonetheless