x=3,y=-x+5(x>1) y=-x+5(x≤1),y=?
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x=3,y=-x+5(x>1) y=-x+5(x≤1),y=?
x=3,y=-x+5(x>1) y=-x+5(x≤1),y=?
x=3,y=-x+5(x>1) y=-x+5(x≤1),y=?
x=3
y=-x+5(x>1)
y=2
(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
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
x=3,y=-x+5(x>1) y=-x+5(x≤1),y=?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
化简 x / y(x+y) - y / x(x+y) =
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
y=x(x
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x