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: a) (x+2)^2-(x+3)(x-3)+10 b) (x+5)(x^2-5x+25)-x(x-4)^2+16x c) (x-2y)^3-(x+2y)(x^2-2xy+4y^2)+6x^2y (giup em voi )

Toán Lớp 8: a) (x+2)^2-(x+3)(x-3)+10
b) (x+5)(x^2-5x+25)-x(x-4)^2+16x
c) (x-2y)^3-(x+2y)(x^2-2xy+4y^2)+6x^2y (giup em voi )

Comments ( 2 )

  1. #huy
    a) (x+2)^2-(x+3)(x-3)+10
    =x^2+4x+4-(x^2-9)+10
    =x^2+4x+4-x^2+9+10
    =4x+23
    b) (x+5)(x^2-5x+25)-x(x-4)^2+16x
    =(x+5)(x^2-5x+5^2)-x(x^2-8x+16)+16x
    =x^3-5^3-x^3+8x^2-16x+16x
    =8x^2+125
    c) (x-2y)^3-(x+2y)(x^2-2xy+4y^2)+6x^2y
    =x^2-6x^2y+12xy^2-8y^3-[x^3-(2y)^3]+6x^2y
    =x^3+12xy^2-8y^3-x^3-8y^3
    =12xy^2-16y^3
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
     Gửi bn 
    Chúc bn học tốt!
    Xin ctlhn+5sao!

    toan-lop-8-a-2-2-3-3-10-b-5-2-5-25-4-2-16-c-2y-3-2y-2-2y-4y-2-6-2y-giup-em-voi

Leave a reply

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

About Hoa