Question

Найди значение выражения: 7²;(-7)²;1,2²;(-1,2)²;(1/3)²;(-1/3)².

Answer 1

7^2=49 (-7)^2=49 1,2^2=1,44 (-1,2)^2=1,44 (1/3)^2=1/9 (-1/3)^2=1/9

Answer 2

$\displaystyle \tt\\ 7^2=7\cdot7=49\\\\(-7)^2=(-7)\cdot(-7)=49\\\\ 1.2^2=1.2\cdot1.2=1.44\\\\ (-1.2)^2=(-1.2)\cdot(-1.2)=1.44\\\\\bigg(\frac{1}{3}\bigg)^2=\frac{1}{3}\cdot \frac{1}{3}=\frac{1}{9}\\\\ \bigg(-\frac{1}{3}\bigg)^2=\bigg(-\frac{1}{3}\bigg) \cdot \bigg(-\frac{1}{3}\bigg)=\frac{1}{9}$