还有,计算1-(3xy-x)+【-2(2x+3xy)】
还有,计算1-(3xy-x)+【-2(2x+3xy)】
计算:3xy[2xy-x(y-2)+x]
计算3xy[2xy-x(y-2)+x-1]
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算:(1)(7-3x)+(5x-6) (2)-(x^2-3)-(7-5x^2) (3)xy-(3x-2xy)+(3xy
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
1.计算 (-x方+2xy-y方)-2(xy-3x方)+3(2y方-xy)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
(2X平方y+3xy平方)-(6x平方-3XY平方)(计算)
计算:(-7x²y)(2x²y-3xy³+xy)
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
通分计算:(1)2x-3/(x-1)(x-4) - x-2/(1-x)(4-x) (2)x平方-y平方/xy - xy-