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: tính x(x^2-5x+2)-(x-3)(x^2-2) 4x(x^2-x-1)-(x^2-2)(x+3) (x-5)(x+7)-7x(x+3) x(x^2-x-2)-(x+5)(x-1) ai làm nhanh em cho trlhn ạ

Toán Lớp 8: tính
x(x^2-5x+2)-(x-3)(x^2-2)
4x(x^2-x-1)-(x^2-2)(x+3)
(x-5)(x+7)-7x(x+3)
x(x^2-x-2)-(x+5)(x-1)
ai làm nhanh em cho trlhn ạ

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    a)x(x²-5x+2)-(x-3)(x²-2)
    = x³-5x²+2x-(x³-2x-3x²+6)
    = x³-5x²+2x-x³+2x+3x²-6
    = -2x²+4x-6
    b) 4x(x²-x-1)-(x²-2)(x+3)
    = 4x³-4x²-4x-(x³+3x²-2x-6)
    = 4x³-4x²-4x-x³-3x²+2x+6
    = 3x³-7x²-2x+6
    c) (x-5)(x+7)-7x(x+3)
    = x²+2x-35-7x²-21x
    = -6x²-19x-35
    d) x(x²-x-2)-(x+5)(x-1)
    = x³-x²-2x-(x²+4x-5)
    = x³-x²-2x-x²-4x+5
    = x³-2x²-6x+5

Leave a reply

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