3xy^2-2xy-二分之三x^2y+(3x^2y-2xy^2)
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
已知x(x-1)-(x^2-y)=-3求(二分之y-x+2xy)-xy 快,
(3x²y-xy²+2xy)/二分之一xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(xy-x^2)乘以(xy)/(x-y)
已知(x—3)的平方+3y+1的绝对值=0,求3x的平方y—{2xy的平方—2(xy—二分之三)+xy} +3xy的平方
x^2-xy-6y^2+3xy+y+2
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(-3x^y+2xy)-( )=4x^+xy
(x+2y-3xy)-(-2x-y+xy),其中x+y=二分之一,xy=-二分之一用整体代入法求值.
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2