Question

упростите выражение :1) 6х(2х-1)-7х
2(5х-4у+1)-3(3х-3у+1)

Answer 1

1. 12х-6х-7х=-1х 
2.10х-8у+2-9х+9у+3=10х-9х-8у+9у+2+3=1х-1у+5

Answer 2

1)..=12x^2-6x-7x=12x^2-11x
2)...=5x-4y+1-9x+9y-3=5y-4x-2y