Respostas
Resposta:
1) 2(3X+5)
2.3X+2.5
6X+10
2)7(4y-2X)
7.4y-7.2x
28y-14x
3) 2x(2y+4x)
2x.2y+2x.4x
4xy+8x2
4) x(1-y)+y(1+x)
x-xy+y+xy
x+y
5)xy(x+y)
xy.X+xy.Y
x2y+xy2
6)x(x+y+z) y(x+y+z)+z(x+y+z)
(x+y+z).(x+y+z)
(x+y+z)2
7) 3x(2x-3y)
3x.2x-3x.3y
6x2-9xy
Resposta:
a) 2.(3x +5) =
2.3x + 2.5 =
\ / \ /
6x + 10 =
6x = -10
x = -10/6 simplificando por 2
x = -5/3
b) 7.(4y -2x) =
7.4y - 7.2x =
\ / \ /
28y - 14x
c) 2x.(2y + 4x) =
2x.2y + 2x.4x =
\ / \ /
4xy + 8x²
d) x (1 - y) + y.(1 + x) =
x.1 - x.y + y.1 + y.x =
\ / \ / \ / \ /
x - xy + y + xy = -xy cancela +xy
x + y
e) xy (x +y) =
xy.x + xy.y =
x²y + xy²
d) x(x + y + z) +y(x + y + z) + z(x + y + z) =
x.x + x.y + x.z + y.x +y.y + y.z + z.x + z.y + z.z =
\ / \ / \ / \ / \ / \/ \ / \ / \ /
x² + xy + xz + xy + y² + yz + xy + yz + z² =
x² + y² + z² + xy + xy + xy + xz +yz + yz =
\ | / \ /
x² + y² + z² + 3xy + xz + 2yz
e) 3x (2x -3y) =
3x.2x - 3x.3y =
\ / \ /
6x² - 9xy
Explicação passo-a-passo: