(3y-2x)/4=(x+y)/3=(3x-y+1)/5的解题过程?
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(3y-2x)/4=(x+y)/3=(3x-y+1)/5的解题过程?
(3y-2x)/4=(x+y)/3=(3x-y+1)/5的解题过程?
(3y-2x)/4=(x+y)/3=(3x-y+1)/5的解题过程?
由(3y-2x)/4=(x+y)/3
得:9y-6x=4x+4y
即:y=2x
由(x+y)/3=(3x-y+1)/5得:
5x+5y=9x-3y+3
即:4x-8y=-3
将y=2x代入4x-8y=-3
得:4x-16x=-3
所以x=0.25
所以y=0.5
供参考!JSWYC
(3y-2x)/4=(x+y)/3=(3x-y+1)/5
=[(3y-2x)-3(x+y)]/(4-3*3)=X
=(x+y)/3
所以y=2x;
在带入后面一个方程即
(3x-2x+1)/5=x
x=1/4
y=1/2
当然也可以用2元一次方程的解法解
同乘60,即15(3y-2x)=20(x+y)=12(3x-y+1),
15(3y-2x)=20(x+y), => 2x=y,
20(x+y)=12(3x-y+1), =>y=1/2.
∴x=y/2=1/4.
(3y-2x)/4=(x+y)/3=(3x-y+1)/5
=[(3y-2x)-3(x+y)]/(4-3*3)=X
=(x+y)/3
所以y=2x;
在带入后面一个方程即
(3x-2x+1)/5=x
x=1/4
y=1/2
当然也可以用2元一次方程的解法解
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
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
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+y)(2x-3y)=?