1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1,
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1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1,1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1,1/4(x+y)+3/8(x-y)=1,
1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1,
1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1,
1/4(x+y)+3/8(x-y)=1,3/4(x-y)-1/2(x+y)=1,
提问15分钟内解答奖励20分[离结束还有10分48秒]1/4(x+y)+3/8(x-y)=1（1）
1/ 4(x-y)-1/2(x+y)=1(2)
(1)*2得：1/2(x+y)+3/4(x-y)=2(3)
(3)+(2)得：x-y=3(4)
将（4）带入（1）得：1/4(x+y)+3/8*3=1
x+y=-1/2（5）
（4）+（5）得：2x=5/2,x=5/4
（5）-（4）得：2y=-7/2,y=-7/4
所以方程组的解为：x=5/4,y=-7/4
联立两式得：1/4(x+y)+3/8(x-y)=3/4(x-y)-1/2(x+y)
移项得：1/4(x+y)+1/2(x+y)=3/4(x-y)-3/8(x-y)
解得：x=3y
将此结果代入两个等式中的任一等式，可解得：x=3/4 y=1/4
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