Mọi người giúp em với ạ :((

Question

Mọi người giúp em với ạ :((
moi-nguoi-giup-em-voi-a

in progress 0
Euphemia 4 years 2020-10-31T07:01:04+00:00 1 Answers 74 views 0

Answers ( )

  1. Ladonna
    0
    2020-10-31T07:03:02+00:00
    Reply

    Đáp án:

     `a)(x+y+2)(x-y+2)`

    `b)2(x+y+2z)(x+y-z)`

    `c)(x-2)(5x-2)`

    `d)(x-2)(5x-2)`

    `e)(2x-1/2)(4x^2+x+1/4)`

    `f)(x+1)(1-5x)`

    Giải thích các bước giải:

     `a) x^2+4x+4-y^2=(x+2)^2-y^2=(x+y+2)(x-y+2)`

    `b) (x+y+2z)^2+(x+y-z)^2-9z^2`

    `=(x+y+2z)^2+(x+y-z-3z)(x+y-z+3z)`

    `=(x+y+2z)^2+(x+y-4z)(x+y+2z)`

    `=(x+y+2z)(x+y+2z+x+y-4z)`

    `=(x+y+2z)(2x+2y-2z)`

    `=2(x+y+2z)(x+y-z)`

    `c) (3x-2)^2-4x^2=(3x-2-2x)(3x-2+2x)=(x-2)(5x-2)`

    `d)` giống câu `c)`

    `e) 8x^3-1/8=(2x-1/2)(4x^2+x+1/4)`

    `f) (2x-1)^2-9x^2=(2x-1-3x)(2x-1+3x)=(-x-1)(5x-1)=(x+1)(1-5x)`

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )