1、(-4xy^3)(-xy)+2y^2(3xy)^22、(-3a^2bc^3)^2b-2a^4b(bc^3)^23、3a^3(ab^2)^4+(-5ab^2)^2-2a^2b^4
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(-3xy+2xy)-(4xy+xy)
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2)
已知1/x-1/y=2,求3x+7xy-3y/2x-3xy-2y答案是1/x-1/y=2(y-x)/xy=2 得:x-y=-2xy(3x+7xy-3y)/(2x-3xy-2y)=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy)=xy/(-7xy)=-1/7 谁能帮我解释一下=[3(x-y)+7xy]/[2(x-y)-3xy]=(-6xy+7xy)/(-4xy-3xy) 是怎
xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2
(X-3xy+4xy-y)-[-2x-2(xy-3/2xy)-y]+6xy的过程
化简 2(xy-xy²+3)-(-4xy²+xy-1) 其中,x等于--4,y等于-3
3xy-4xy-(-2xy)
3xy-4xy-(-2xy)
(1)3xy-4xy-(-2xy)
4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6
xy^2-2xy+2y-4
xy^2-2xy+2y-4
5xy的立方-{2xy的平方-【3xy的平方-(4xy的平方-2xy的平方)】}其中x=2 y=1
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值