5x^2y/-1/2xy*3xy^2
5x^2y/-1/2xy*3xy^2
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
计算3xy[2xy-x(y-2)+x-1]
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
y^3+xy^2+2xy+x^2-1 因式分解
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2