Question

m为何值时,(3m-7)x/3m-(2m+1)x=m(x-3)+7的解是负数

Answer 1

*** 注意:"m2" 在下面代表m的二次方,因为百度不能显示所以只能这样打出来了.

move the term such that:

x=(21m-9m2)/(-9m2-7)

x0

m(9m-21)>0

m(3m-7)>0

(m>0 and 3m-7>0) or (m7/3) or (m