两道超简单二（三）元一次方程的计算题,速求2(x-y)/3=x+y/4-16(x+y)=4(2x-y)+162x+y-z=2x+2y=5x-y+2z=-7
2019-04-13
两道超简单二（三）元一次方程的计算题,速求
2(x-y)/3=x+y/4-1
6(x+y)=4(2x-y)+16
2x+y-z=2
x+2y=5
x-y+2z=-7
优质解答
2(x-y)/3=x+y/4-1
(2x-2y)*4=(x+y)*3-12
8x-8y=3x+3y-12
5x-5y=-12
x-y=-2.4①
6(x+y)=4(2x-y)+16
6x+6y=8x-4y+16
-2x+10y=16
5y+x=8②
②-①:5y+x-x+y=8-2.4
6y=5.6
y=5.6/6
x=-2
2x+y-z=2①
x+2y=5②
x-y+2z=-7③
①*2+③:4x+2y-2z+x-y+2z=-3
5x+y=-3④
④*2-②:10x+2y-x-2y=-11
9x=-11
x=-11/9
2(x-y)/3=x+y/4-1
(2x-2y)*4=(x+y)*3-12
8x-8y=3x+3y-12
5x-5y=-12
x-y=-2.4①
6(x+y)=4(2x-y)+16
6x+6y=8x-4y+16
-2x+10y=16
5y+x=8②
②-①:5y+x-x+y=8-2.4
6y=5.6
y=5.6/6
x=-2
2x+y-z=2①
x+2y=5②
x-y+2z=-7③
①*2+③:4x+2y-2z+x-y+2z=-3
5x+y=-3④
④*2-②:10x+2y-x-2y=-11
9x=-11
x=-11/9