(1)x+y/x^3-y^3 +2y/y^3-x^3(2)(1-4x)^2/2x+3 乘 4x^2+12x+9/4x-1(3)x+2/x+1 - x+3/x+2 - x-4/x-3 + x-5/x-4
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(1)x+y/x^3-y^3 +2y/y^3-x^3
(2)(1-4x)^2/2x+3 乘 4x^2+12x+9/4x-1
(3)x+2/x+1 - x+3/x+2 - x-4/x-3 + x-5/x-4
(1)x+y/x^3-y^3 +2y/y^3-x^3
=(x+y-2y)/(x^3-y^3)
=(x-y)/[(x-y)(x^2+xy+y^2)]
=1/(x^2+xy+y^2)
(2)(1-4x)^2/2x+3 乘 4x^2+12x+9/4x-1
=(4x-1)^2/(2x+3)*(2x+3)^2/(4x-1)
=(4x-1)(2x+3)
(3)x+2/x+1 - x+3/x+2 - x-4/x-3 + x-5/x-4
=[(x+1)+1]/(x+1)-(x+2+1)/(x+2)-(x-3-1)/(x-3)+(x-4-1)/(x-4)
=1+1/(x+1)-1-1/(x+2)-1+1/(x-3)+1-1/(x-4)
=(x+2-x-1)/(x+1)(x+2)+(x-4-x+3)/(x-3)(x-4)
=1/(x+1)(x+2)-1/(x-3)(x-4)
=(x^2-7x+12-(x^2+3x+2))/(x+1)(x+2)(x-3)(x-4)
=-10(x-1)/(x+1)(x+2)(x-3)(x-4)
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
x(x-y)2-(y-x)3
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
计算:x+2y/x-y+2x/y-x-3y/x-y
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y
(Y-X)^3*(X-Y)^m+(X-Y) ^m+1*(Y-X)^2
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(3x-y)(3y+x)-(x-y)(x+y)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?