00之前要.一、化简:(1)【x-(y-z)】-【(x-y)-z】(2)(8xy-3x²)-5xy-3(xy-

3个回答

  • 【x-(y-z)】-【(x-y)-z】

    =x-y+z-x+y+z

    =2z

    (8xy-3x²)-5xy-3(xy-2x²+3)

    =8xy-3x²-5xy-3xy+6x²-9

    =3x²-9

    3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y)

    =3x-3y-2x-2y-5x+5y+4x+4y+3x-3y

    =3x-y

    5(2x-3)+4(3-2x)

    =10x-15+12-8x

    =2x-3

    -4x+3(1/3x-2)

    =-4x+x-6

    =-6-3x

    4a-(a-3b)

    =4a-a+3b

    =3a-3b

    a+(5a-3b)-(a-2b)

    =a+5a-3b-a+2b

    =5a-b

    3(2xy-y)-2xy

    =6xy-3y-2xy

    =4xy-3y