y=[(X^5+2（x^0.5)-5)/x^3求导数
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y=[(X^5+2（x^0.5)-5)/x^3求导数y=[(X^5+2（x^0.5)-5)/x^3求导数y=[(X^5+2（x^0.5)-5)/x^3求导数y''=2*x-5/x^(7/2)+15/x^
y=[(X^5+2（x^0.5)-5)/x^3求导数
y=[(X^5+2（x^0.5)-5)/x^3求导数
y=[(X^5+2（x^0.5)-5)/x^3求导数
y'=2*x-5/x^(7/2)+15/x^4
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x-5y)(-x-5y)-(-x+5y)^2,其中x=0.5,y=-1.计算
(x-5y)(-x-5y)-(-x-5y)^2其中x=-1,y=-0.5
二元一次方程组 X-Y/7-X+Y=0.5 2(X-Y)+5(X+Y)=3
x-y=2 那么-2x-2y=多少[（2x=y)的平方-（2x+y)(2x-y)-y(5x+y)]/(0.5y),其中x-y=2
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
x*x+2x+y*y-4y+5=0 x= y=
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
求(X+Y)(X-Y)(X²+Y²),X=5 Y=2,
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?