Question

Me ajudem pfvr

1)Efetue as multiplicações

a) 2x(x-y)-[x(x+y-2)-y(x-2)]-2x

b) a(a-b)-b(b+a-2)+ab(1-a+b)+b²

Answer 1

a) 
$2x^{2}-2xy-x^{2}+xy-2x-yx+2y-2x= \\ x^{2}-2xy+2y-4x$
b) 
$a^{2}-ab-b^{2}-ba+2b+ab-a^{2}b+ab^{2}+b^{2}= \\ a^{2}-ab+2b-a^{2}b+ab^{2}$