18x-9y=-9 5x-9y=-35
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18x-9y=-95x-9y=-3518x-9y=-95x-9y=-3518x-9y=-95x-9y=-35x=2y=5x=2y=5
18x-9y=-9 5x-9y=-35
18x-9y=-9 5x-9y=-35
18x-9y=-9 5x-9y=-35
x=2
y=5
x=2 y=5
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
解方程组：2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
5x=3y,(2x+y)的平方=5x(x+y)+9
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
y+10x=x+y+9 10y+x=y+10x+27
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
f(x,y)=x*x*x+y*y*y-9xy+27极值
18x/34y=9/1 x/y=?/?
计算18x+9y=14x+15y
5x-y=110 9y-x=110
Y=x+3 7x+5y=9
y-x=3 7x+5y=-9
y=x+3 7x+5y=9
x y=5 x-y=9怎么解
x+y=5 x-y=9怎么解
{y=x+3,7x+5y+9;