Question

efetue as multiplicaçoes e calcule as equaçoes: A) 7x.(x-3y)= B) 3ab.(2a+b)= C) -10xy².(-3xy+2y²)= D) 4ab.(a²-10ab+6b²)= E) 18x-25=62= F)13x-11=15x+21 G)3(x+5)-(x+7)=4(1-x)

Answer 1

faz a distributiva
a= 7x²-21xy
b=6a²+3ab²
c=30x²y³-20xy³
d=4a³b-40a²b²+24ab³
e=18x-25=62
18x=62+25
18x=87
x=87/18
f=13x-15x=21+11
-2x=32
x=-32/2
x=16