Question

Вычислите: а) 17^2-34-7+7^2;B б) ( (671 (2)- [33]
^2)/( (15) ^2-25).​

Answer 1

а)

$17^2-34\cdot 7+7^2=17^2- 2\cdot 17\cdot 7+7^2=(17-7)^2=10^2=100$

б)

$\frac{67^2-33^2}{15^2-25} =\frac{(67-33)\cdot (67+33)}{(15-5)\cdot (15+5)}=\frac{34\cdot 100}{10\cdot 20}=\frac{34}{2}=17$