计算{-1/3x^2}^3*(-3xy^2)^2
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
还有,计算1-(3xy-x)+【-2(2x+3xy)】
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算:(1)(7-3x)+(5x-6) (2)-(x^2-3)-(7-5x^2) (3)xy-(3x-2xy)+(3xy
1、计算:-3(2X^2-XY)+4(X^2+XY-6)
(2X平方y+3xy平方)-(6x平方-3XY平方)(计算)
计算:(-7x²y)(2x²y-3xy³+xy)
1.计算 (-x方+2xy-y方)-2(xy-3x方)+3(2y方-xy)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(-3x^2y)(1/3xy^2)=?