(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
求和:(x+1/y)+[x^2+1/(y^2)]...+[x^n+1/(y^n)](x,y不等于1)
集合N={(x,y)|(x-1)^2}+(y-1)^20},M={(x,y)|x^2+y^2
(x-y/x+2y)³
计算(x-y)^3n*(y-x)^2n÷(y-x)^5n(n为正整数,且x≠y)
设y=x(x-1)(x-2)(x-3)——(x-n),则y^(n+1)=?
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
已知M={(x,y)|2x+3y=4320,x,y∈N},N={(x,y)|4x-3y=1,x,y∈N},则( )
(x-y)(x-2y)-(3x-2y)(x-3y)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(