计算,(-1/2x²y)^-3·(1/3xy^-2)²
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算3xy[2xy-x(y-2)+x-1]
计算2分之1xy²(-2xy)+3x²y的3次方=
计算:(2分之1x^(2)y-2xy+y^(2))·3xy
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(-7x²y)(2x²y-3xy³+xy)
计算:2x+2y分之3y + x²+xy分之2xy
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
合并同类项并计算 -3[y-(3x²-3xy)]-[y+2(4x²-4xy)]其中,x=3,y=1/