Question

reduzir as expressaoes:
a) -7xy+2xy-xy+9xy-4xy-2xy+3xy+7xy
b) (5x²-8x+4)-(x²+3x-1)+(4x²-7)

Answer 1

a) -7xy+2xy-xy+9xy-4xy-2xy+3xy+7xy
2xy+3xy+9xy-4xy-xy
14xy-5xy
9xy

b) (5x²-8x+4)-(x²+3x-1)+(4x²-7)
5x²-8x+4-x²-3x+1+4x²-7
5x²-x²+4x²-8x-3x+4-7+1
8x²-11x-2