计算题 xy【y^2+x^2】-y^2【xy+2x】-3xy
(2×y+x²-y²)-(x²-y²-3xy) 计算题,
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)
(xy-x^2)乘以(xy)/(x-y)
一道计算题:(2x^3y^2-3x^2y+4xy^3)/(-2x)/(-y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^2-xy-6y^2+3xy+y+2
(x^2+xy/x-y)/(xy/x-y)计算
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(-3x^y+2xy)-( )=4x^+xy
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