2x+y-2=0 x-2y+4=0怎么解
问题描述：
2x+y-2=0 x-2y+4=0怎么解
答
2x+y-2=0 x-2y+4=0
2x+y=2 x-2y=-4
由x-2y=-4得x=2y-4
将x=2y-4代入2x+y=2
得：y=2
将：y=2代入x=2y-4
得：x=0
解得：x=0 y=2x-y+1＝0 x+y-2＝0怎么解 求详细过程x-y+1＝0 x+y-2＝0x-y＝-1x+y=2由x-y＝-1得x=y-1所以y-1+y=2得：y=3/2所以x=3/2-1=1/2得x=1/2y=3/2