已知m,n是有理数,不等式3m-4n+(2m-n)x
问题描述:
已知m,n是有理数,不等式3m-4n+(2m-n)x
2m-3n+(m-4n)x>0的解集
答
-9x+44
x>4/9
3m-4n+(2m-n)x(3m-4n)/(n-2m)
则(3m-4n)/(n-2m)=4/9
4(n-2m)=9(3m-4n)
4n-8m=27m-36n
40n=35m
8n=7mn>2m 则m0
-5/8-5/2x-16/25