[(2xy^3)^2÷(3x)]·[8xy÷(4xy)],其中x=1000,y=-1
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
(8xy-3x平方)-5xy-2(3xy-2x平方),其中,x=2,y=-1
-3(2x-xy)-4(-6+xy+x.其中x=1,y=-1
3x^2y-[2xy^2-4(1/2xy-3/4x^2y)+xy]+3xy^2,其中x=3,y=-1/3
先化简再求值:xy^3÷(-xy)+(x+2y)(x-2y),其中x=根号2,y=1
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
(x+2y-3xy+2x+y-xy)-(-2-y+xy),其中x+y=2分之1,xy=-2分之1
化简求值:[(xy-2)²+4xy-4]÷(xy),其中x=10,y=1/25
(-3x^y+2xy)-( )=4x^+xy