Question

已知方程组:2x+y=3m+1,x-y=2m-1.运用不等式的性质将此不等式化为m＞a或m＜a的形式.

Answer 1

2x+y=3m+1①

x-y=2m-1②

①+②得：

3x=5m

x=5m/3

y=2m-1-x=2m-1-5m/3

=m/3-1

x＞y

即：5m/3＞m/3-1

4m/3＞-1

m＜3/4