Register Now

Login

Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Bài 1:tính a,2y.(y-2) b,4xy.(y-3x) c,x².(x+3)-x.(x+6) d,6.(xy+5)-2x.(y+3)

Toán Lớp 8: Bài 1:tính
a,2y.(y-2)
b,4xy.(y-3x)
c,x².(x+3)-x.(x+6)
d,6.(xy+5)-2x.(y+3)

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    a)2y(y-2)=2y.y-2y.2=2y^2 -4y
    b)4xy(y-3x)=4xy.y-4xy.3x=4xy^2 -12x^2 y
    c)x^2 (x+3)-x(x+6)=x^3 +3x^2 -x^2 -6x=x^3 +2x^2 -6x
    d)6(xy+5)-2x(y+3)=6xy +30-2xy-6x=4xy+30-6x

Leave a reply

222-9+11+12:2*14+14 = ? ( )