m= 时,方程组2x-my=3;x-y=0的解中x,y的值都为正.
问题描述:
m= 时,方程组2x-my=3;x-y=0的解中x,y的值都为正.
答
x=y
2x-mx=3
(2-m)x=3
x=3/(2-m)>0
2-m>0
m