计算:(-3x^2y)*(1/3xy^2)=______
计算:3xy[2xy-x(y-2)+x]
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算3xy[2xy-x(y-2)+x-1]
因式分解:(x+y)(x+y+2xy)+(xy+1)(xy-1)=______.
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(-7x²y)(2x²y-3xy³+xy)
合并同类项并计算 -3[y-(3x²-3xy)]-[y+2(4x²-4xy)]其中,x=3,y=1/
1.计算 (-x方+2xy-y方)-2(xy-3x方)+3(2y方-xy)
计算:(-3x^2y)(1/3xy^2)=?
计算:(-3x^y)(1/3xy^2)=?
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6