-2^3y[3xy^2-3xy+1】=【】【过程】
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-2^3y[3xy^2-3xy+1】=【】【过程】
-2^3y[3xy^2-3xy+1】=【】【过程】
-2^3y[3xy^2-3xy+1】=【】【过程】
-2^3y[3xy^2-3xy+1】
=-24xy^3+24xy^2-8y
(-3xy+2xy)-(4xy+xy)
2xy-xy-(-3xy)=
( )-(x^2+3xy)=-xy-1/3y^2
当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值
xy-3xy+2xy-xy
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
[6xy-3(xy-1/2x的平方y]/3xy=?
计算(-3分之1xy²)²×[xy(2x-y)+xy²]=
2x²y-3(2xy-xy)-xy
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
3xy²-[xy-2(xy-3/2x²y)+3xy²]+3xy²,其中x=3,y=-1/3 化简求值
若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思,是3x-2xy-3y/x-2xy-y
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6
(-xy^-1)^2*(-xy^-2)^-3/(-x^2y^3)