把下列各式分解因式1.(a-b)³-(a-b)²2.3m(x-y)-n(y-x)3.(x-y)四次方

2个回答

  • 1.(a-b)³-(a-b)²

    =(a-b)²(a-b-1)

    2.3m(x-y)-n(y-x)

    =3m(x-y)+n(x-y)

    =(x-y)(3m+n)

    3.(x-y)4+x(x+y)³-y(x+y)³

    =(x-y) 4+(x+y)³(x-y)

    =(x-y)[(x-y)³+(x+y)³]

    =(x-y){(x-y+x+y)[(x-y)²-(x-y)(x+y)+(x+y)²]}

    =2x(x-y)(x²+3y²)

    4.(m-n)(p-q)-(m+n)(p-q)

    =(p-q)(m-n-m-n)

    =2n(q-p)

    5.4p(1-p)³+2(p-1)²

    =(1-p)²(4p-4p²+2)

    =-2(1-p)²(2P²-2p-1)

    1.(x-4)²-(4-x)(8-x)=12

    (x-4)(x-4+8-x)=12

    4(x-4)=12

    x=7

    2.(a+b-c)(a-b+c)-(b-a+c)(b-a-c)

    =(a-b+c)(a+b-c+b-a+c)

    =2b(a-b+c)

    因为a-b+c=0

    所以原式等于0

    3.x(x+y)(x-y)-x(x+y)²

    =x(x+y)(x-y-x-y)

    =-2xy(x+y)

    代入

    原式=-12*5=-60