|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
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|x|=3|y|=5|x-y|=|x|+|y|求X+Y和X-Y等于多少|x|=3|y|=5|x-y|=|x|+|y|求X+Y和X-Y等于多少|x|=3|y|=5|x-y|=|x|+|y|求X+Y和X-
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
|x|=3 x=3或-3 |y|=5 y=5或-5 |x-y|=|x|+|y| |x|=3 |y|=5 |x|+|y|=8 |x-y|=8
x-y=8或-8 由此可得 y=5 x=-3 或y=-5 x=3 x+y=2或-2 x-y=8或-8
（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
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
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
（5x+3y)(3y-5x)-(4x-y)(4y+x)=
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
化简 x / y(x+y) - y / x(x+y) =
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空