Question

efetue e simplifique: (x + 4y) . (x-y) - 3xy/2x²-4y.(2x-2y)

Answer 1

x²-xy+4xy-4y²-3xy
_______________
2x²-8xy+8y²

x²-4y²
_____
2(x²-4xy+4y²)

(x+2y)(x-2y)
_________
2(x-2y)(x-2y)

= (x+2y)
_____
2(x-2y)