Question

(a-b)^2-(a-1)(b+2) упростите

Answer 1

$a^{2} -2ab+ b^{2} -(ab+2a-b-2)= a^{2} -2ab+ b^{2} -ab-2a+b+2=0 \\ a^{2} + b^{2}-3ab-2a+b+2$