{3X-Y=5{5Y-1=3X+5这是一个两元一次方程,
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{3X-Y=5{5Y-1=3X+5这是一个两元一次方程,
{3X-Y=5
{5Y-1=3X+5
这是一个两元一次方程,
{3X-Y=5{5Y-1=3X+5这是一个两元一次方程,
3x-y=5 1
-3x+5y=5+1 2
1+2得 4y=11
y=4/11
y=4/11代入1得x=31/12
整理联立方程组3x-y=5~~~1 3x-5y=-6~~2 1-2:4y=11 y=11/4 x=31/12
就是这样的,呃~~虽然数字算出来很恐怖
y= 11/4
x=31/12
解:将3X+5与5Y-1换位置,与3X-Y=5合并,为Y+5=5Y-1-5,解得Y=1/4,将Y=1/4代入3X-Y=5,得X=7/4
={3X-Y=5 1{5Y-3X=6 2 求2{-3X+5Y=6 3 将3+1={4Y=11 y=11\4...............下面你应该知道
(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=?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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;
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
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
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5