(-1/2xy^2)^3-1/6x(xy^3)^2=
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[6xy-3(xy-1/2x的平方y]/3xy=?
3xy乘以[6 xy-3(xy-1/2x的平方y)]
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
①(9x²y-6xy²)÷3xy ②(3x²y-xy²+2分之1xy)÷(-2分之1xy)
1-(3xy-x)+【-2(2x+3xy)】
计算3xy[2xy-x(y-2)+x-1]
已知(x+1)*(x+1)=-Iy-1I,求2(xy-(5xy)*(5xy))-3((xy)*(xy)-xy)
(-xy^-1)^2*(-xy^-2)^-3/(-x^2y^3)
y^3+xy^2+2xy+x^2-1 因式分解
5x^2y/-1/2xy*3xy^2
( )-(x^2+3xy)=-xy-1/3y^2
xy(xy+1)+xy+3-2(x+y+1/2)-(x+y-1)^2因式分解
(-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)]
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
1-2/x+y=xy,4y+6x=xy.求xy的解?
XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+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
5xy^2-{2x^y-[3xy^2-(xy^2-2x^2y)]/(-1/2xy)}