若方程组4x-2y=6,ky+y=5的解x,y的和
若方程组4x-2y=6,ky+y=5的解x,y互为相反数,则K=
人气:499 ℃ 时间:2020-05-19 10:58:55
解答
因为x、y互为相反数,即x+y=0,再联立方程组,解得x=1,y=-1,
由ky+y=5,得y=5/(k+1),解得k=-6
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