Question

Simplifique as expressões:

a) 2xy+(2x-y)²-(x-y)²=


b) (ab+1,2)²-(ab-1,2)²=

Answer 1

A)2xy+(2x-y)²-(x-y)²
2xy+(2x-y).(2x-y)-((x-y).(x-y))
2xy+4x²-2xy-2xy+y²-(x²-xy-xy+y²)
4x²-2xy+y²-x²+xy+xy-y²
3x²

(ab+1,2)²-(ab-1,2)²
(ab+1,2).(ab+1,2)-((ab-1,2).(ab-1,2))
ab²+1,2ab+1,2ab+1,44-(ab²-1,2ab-1,2ab+1,44)
ab²+2,4ab+1,44-ab²+1,2ab+1,2ab-1,44
4,8ab