.4^{3}-.7^{3}-.3^{3}= what and how to do it

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- Mar 1st 2013, 10:20 AMpawiisolve this formula
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^{3}-.7^{3}-.3^{3}= what and how to do it - Mar 1st 2013, 10:54 AMMacstersUndeadRe: solve this formula
Use a calculator or solve by hand. To solve by hand, I find that it helps to write each decimal into a fraction and then recall the fact that $\displaystyle (\frac{a}{b})^n = \frac{a^n}{b^n}$

For example, $\displaystyle (.4)^3 = (\frac{4}{10})^3 = \frac{4^3}{10^3} = \frac{64}{1000}$ The process is similar with the other decimals in this formula. then it's a simple matter of addition and subtraction of fractions.