Question about Casio fx-300ES Calculator

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Unable to enter a formula correctly to get the right answer

1.3(4/4+1(1-0.3)+0.15(1(1-.3)/4+1(1-0.3))

I know the answer to this is 1.129 but the closest I get is 1.49965 by putting the formula in the calculator in pieces!

Many thanks.

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  • Casio Master
  • 7,987 Answers

The expression that gives you the result you were looking for is as in the screen capture.

unable to enter a formula correctly to get the rig - 537ca7e.jpg
It is to say the least a very clumsy way to write it and I am not surprised you made mistakes typing it. I would too.

At leats unclutter the expression by removing all those 1 before a parenthesis. If there is nothing explicitely written before a parenthesis it is always 1x the content of the parentheses.

That is what it looks like after removing the redundant 1x

60f80a8.jpg

You can still do better by computing the differences inside the varunable to enter a formula correctly to get the rig - 3704b12.jpgal parentheses. (1-0.3)=0.7
3704b12.jpg
You can still arrange it further. And I leave it to you.
Having a calculator is not a sufficient reason to park the brain in idle gear.

Posted on Jul 21, 2010

  • k24674 Jul 22, 2010

    Apparently I made a mistake too.


    This becomes



  • k24674 Jul 24, 2010

    One final remark. The way you wrote your expression is ambiguous. A few extra parentheses would have helped. However if you use your Casio 300ES in MthIO you will be able to check if what you key in is exactly what you write on paper (provided you use the fraction bars.)

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