解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
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解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
另a=1/(x+y),b=1/(x-y);
则2a+5b=18;9a+10b=66;
解得a=6,b=6/5;
即 1/(x+y)=6
1/ (x-y)=6/5
故 x+y=1/6
x-y=5/6
解得 x=1/2
y=-1/3
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