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Re: decimals in the exponents for TI-30Xa
Hi, You have a key labeled [Y to the x], use it for all the powers or roots that do not have a dedicated key or key sequence. Let the key be [^]
Ex: 13.675 to the power 1.33 is entered as 13.675 [^] (1.33) [=]. The result is 32.41778634 Ex: (-64)[^](2/3) [=] gives 16 as result. The (-) is the change sign key Ex: (2.87655)^(-6.778) is entered as 2.87655 [^] ( (-) 6.778 ) [=] 0.0007758 The (-) is the change sign (or the negative of), not the regular minus. When you have a negative exponent or a complicated exponent, it is safer to enclose the whole exponent inside parentheses.
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Use the 10^x function in the top row of the keyboard. Press 2nd [10^x] +/- 8 . 8 5 = The +/- key is just to the right of the decimal point key. If you're entering integer exponents, you can use the EE key just above the 7 key. For example, to enter 10^8, you can press 1 EE 8
I do not know what to say. Since you seem to have a problem seeing the decimal mark, it may reduce the guessing if you use the scientific display format, which is always one digit, decimal mark, additional decimal digits, exponent. With this format the decimal mark is always at the second position (if there is no - sign) and at the third (if ther is a - sign). But if you are reluctant to use it there is no solution.