x-2y=50x-30y=5
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x-2y=50x-30y=5x-2y=50x-30y=5x-2y=50x-30y=5x-2y=50x-30y=5意思是x-2y=550x-30y=5X=-2Y=-7/2可以拆开啊,X-2Y=550X-
x-2y=50x-30y=5
x-2y=50x-30y=5
x-2y=50x-30y=5
x-2y=50x-30y=5
意思是
x-2y=5
50x-30y=5
X=-2 Y=-7/2
可以拆开啊,X-2Y=5
50X-30Y=5
然后就是解方程组了。
最后x=-2
y=-7/2
解:X=2Y+5,代入50x-30y=5得50(2Y+5)-30Y=5
所以X=-2,Y=-3.5.
分解成
x-2y=5
50x-30y=5 等式化简 同除以5 10x-6y=1
联立方程组
得 x=-2 y=-3.5
{5x+2y=18,y=-x
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x-2y=50x-30y=5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
3x(2x+y)-2x(x-y),其中x=1,y=1/5
(2x-3y)²-(-2x-3y)(-2x+3y)x+y=10,3x-2y=5过程
解下列方程组:x-2/3x-1=2y,2(x+y)-5x+y=-4
{x=2y {2x-y=3
2(x-y)=5y,x-y=-5
2Y:30%=3X:50%求X:Y
x-y / 5y= (y-x)^2 / ( )
x*x+2x+y*y-4y+5=0 x= y=
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
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