Question

Помогите решить алгебру 8 класс два номера

Answer 1

$9)\sqrt{(6,13^{2}-6,12^{2})(5,8^{2}-4,2^{2})}=\sqrt{(6,13-6,12)(6,13+6,12)(5,8-4,2)(5,8+4,2)}=\sqrt{0,01*12,25*1,6*10}=\sqrt{0,1^{2}*3,5^{2}*16}=0,1*3,5*4=1,4\\\\Otvet:\boxed{1,4}$

$10)\sqrt{b^{2}+14b+49}+\sqrt{b^{2}-10b+25}-\sqrt{36b^{2}}=\sqrt{(b+7)^{2}}+\sqrt{(b-5)^{2}}-\sqrt{(6b)^{2}}=|b+7|+|b-5|-|6b|=b+7+5-b+6b=6b+12\\\\Otvet:\boxed{6b+12}$