初一计算题(-3x^2y^2+6x^2y^2-1/3xy)÷(-1/3xy)

计算题(-3x^2y^2+6x^2y^2-1/3xy)÷(-1/3xy) 计算题：(-3x^2y^3+6x^2y^2-1/3xy)÷(-1/3xy) (2×y+x²-y²)-(x²-y²-3xy) 计算题, 初一数学:计算题,(2x^2-xy)+(x^2+xy-3) 有这样一道计算题：“计算(2x-3xy-2xy)-(x-2x+y)+(-x+3xy-y)的值,其中“x=1/2,y=-1 一道计算题：(2x^3y^2-3x^2y+4xy^3)/(-2x)/(-y) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 计算3xy[2xy-x(y-2)+x-1] (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 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)] 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)