问题描述:
x-y/2-x+y/5=1 3(x-y)+2(x+y)=6
最佳答案:
解:
(x-y)/2-(x+y)/5=1
5(x-y)-2(x+y)=10
5x-5y-2x-2y=10
3x-7y=10 ①
3(x-y)+2(x+y)=6
3x-3y+2x+3y=6
5x-y=6 ②
②×7-①可得,35x-3x=42-10,即x=1,
将x=1代入②中可得,5-y=6,即y=-1
解方程组:x-y/2-x+y/5=1,3(x-y)+2(x+y)=6
问题描述:
x-y/2-x+y/5=1 3(x-y)+2(x+y)=6
解:
(x-y)/2-(x+y)/5=1
5(x-y)-2(x+y)=10
5x-5y-2x-2y=10
3x-7y=10 ①
3(x-y)+2(x+y)=6
3x-3y+2x+3y=6
5x-y=6 ②
②×7-①可得,35x-3x=42-10,即x=1,
将x=1代入②中可得,5-y=6,即y=-1