Question

1) Calcule:
a) 7.(x-2y) =
b) 2x.(x+y) =
c) 4x.(a+b) =
d) 2x.(x2-2x+5) =
e) (x+5).(x+2) =
f) (3x+2).(2x+1) =
g) ( 12x2 - 8x): (+2x) =
h) (3y + 6y): (3y) =
i) ( 10x2 + 6x): (-2x) =
j) (4x3 - 9x): (+3x) =
k) ( 15x - 10x2) : (5x) =
i) (30x2 - 20xy): (-10x) =​

Answer 1

Resposta:

Explicação passo-a-passo:

a) 7.(x-2y) = 7x-14y

b) 2x.(x+y) = 2x²+2xy

c) 4x.(a+b) = 4ax+4bx

d) 2x.(x2-2x+5) = 2x³-4x²+10x

e) (x+5).(x+2) = x²+2x+5x+10 = x²+7x+10

f) (3x+2).(2x+1) = 6x²+3x+4x+2 = 6x²+7x+2

g) ( 12x2 - 8x): (+2x) = 6x-4

h) (3y + 6y): (3y) = 9y:3y = 3

i) ( 10x2 + 6x): (-2x) = -5x-3

j) (4x3 - 9x): (+3x) = 4x²/3-3

k) ( 15x - 10x2) : (5x) = 3-2x

i) (30x2 - 20xy): (-10x) = -3x+2y