设方程组3x+y=k+1 x+3y=3的解xy满足条件0

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设方程组3x+y=k+1x+3y=3的解xy满足条件0设方程组3x+y=k+1x+3y=3的解xy满足条件0设方程组3x+y=k+1x+3y=3的解xy满足条件03x+y=k+1(1)x+3y=3(2

设方程组3x+y=k+1 x+3y=3的解xy满足条件0
设方程组3x+y=k+1 x+3y=3的解xy满足条件0

设方程组3x+y=k+1 x+3y=3的解xy满足条件0
3x+y=k+1 (1)
x+3y=3 (2)
(1)+(2)=4x+4y=k+4
4(x+y)=k+4
(两边同时除以4) x+y=k/4
所以0