(5)解方程组:2分之x+y+3分之x-y=6 ,4(x+y)-5(x-y)=2我知道:(x+y)/2+(x-y)/3=6.①用①×63(x+y)+2(x-y)=36即5x+y=36 后面怎么写呢?

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/15 05:03:21
(5)解方程组:2分之x+y+3分之x-y=6 ,4(x+y)-5(x-y)=2我知道:(x+y)/2+(x-y)/3=6.①用①×63(x+y)+2(x-y)=36即5x+y=36 后面怎么写呢?

(5)解方程组:2分之x+y+3分之x-y=6 ,4(x+y)-5(x-y)=2我知道:(x+y)/2+(x-y)/3=6.①用①×63(x+y)+2(x-y)=36即5x+y=36 后面怎么写呢?
(5)解方程组:2分之x+y+3分之x-y=6 ,4(x+y)-5(x-y)=2
我知道:(x+y)/2+(x-y)/3=6.①
用①×6
3(x+y)+2(x-y)=36
即5x+y=36 后面怎么写呢?

(5)解方程组:2分之x+y+3分之x-y=6 ,4(x+y)-5(x-y)=2我知道:(x+y)/2+(x-y)/3=6.①用①×63(x+y)+2(x-y)=36即5x+y=36 后面怎么写呢?
4(x+y)-5(x-y)=2
既 9y-x=2
再和你算得 5x+y=36 联立
得 x=7 y=1

(x+y)/2+(x-y)/3=6
两边乘6
3(x+y)+2(x-y)=36
3x+3y+2x-2y=36
5x+y=36 (1)
4(x+y)-5(x-y)=2
4x+4y-5x+5y=2
-x+9y=2
所以x-9y=-2 (2)