Question

Помогите пожалуйста.

Answer 1

$\displaystyle\bf\\-2ab^{2} \Big(3a^{2} b-5ab^{2} \Big)=-2ab^{2} \cdot 3a^{2} b-2ab^{2}\cdot (-5ab^{2} )=\\\\\\=-6\cdot a^{1+2} \cdot b^{2+1} +10\cdot a^{1+1} \cdot b^{2+2} =-6a^{3} b^{3} +10a^{2} b^{4} \\\\\\a=1 \ \ ; \ \ b=-1\\\\\\-6a^{3} b^{3} +10a^{2} b^{4} =-6\cdot 1^{3} \cdot (-1)^{3} +10\cdot 1^{2}\cdot (-1) ^{4} =\\\\\\=-6\cdot (-1)+10\cdot 1=6+10=16\\\\\\Otvet \ : \ 16$