4.5x+3y = 2.4x+1.2y = x-y+1 请问这种方程怎么解?请讲详细点,
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4.5x+3y = 2.4x+1.2y = x-y+1 请问这种方程怎么解?请讲详细点,
4.5x+3y = 2.4x+1.2y = x-y+1 请问这种方程怎么解?请讲详细点,
4.5x+3y = 2.4x+1.2y = x-y+1 请问这种方程怎么解?请讲详细点,
4.5x+3y=x-y+1
3.5x+4y=1
2.4x+1.2y=x-y+1
1.4x+2.2y=1
合并 一下2 、4式 消掉一项未知数、再求另一个就OK了
4.5x+3y = 2.4x+1.2y
4.5x-2.4x=1.2y-3y
x=-6y/7
2.4*(-6y/7)+1.2y=-6y/7-y+1
y=1
x=-6/7
(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
推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做.
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
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
化简 x-y/(y-x)^3=
(x+y)(2x-3y)=?
(3x-y)(3y+x)-(x-y)(x+y)
化简 x / y(x+y) - y / x(x+y) =
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知x-y=3,求[(x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
1.2x=3/4y,x+y=2.6,x和y分别是多少