英语数学题:
The integer solutions of the inequalities about"x" [3(x-a)+2≥2(1-2x-a)] and [(x+b)÷3<(b-x)÷2] are 1,2,3,then the number of integer pairs (a,b) is ( )
先翻译
人气:367 ℃ 时间:2020-02-02 11:10:33
解答
大家都写错了,我的才对,
翻译:所给的关于x的不等式的整数解是1,2,3.,那么由整数a跟b组成的组合有几个?
由[3(x-a)+2≥2(1-2x-a)] 得x≥ a/7
由[(x+b)÷3<(b-x)÷2] 得x<b/5
所以a/7≤x<b/5
因为x的不等式的整数解是1,2,3
所以1≥a/7>0,解得7≥a>0,a可以取7,6,5,4,3,2,1,共7种可能
3
推荐
- There is duck in front of two ducks.There is a duck between two ducks.There is a duck behind two ducks.How many ducks ar
- Given the 100 students in the Springdale High School senior class,38 students are taking math,45 students are taking psy
- Two numbers are in the tatio 2:3.When 4 is added to each number the ratio changes to 5:7.
- A girl has brother and sister.
- 急,
- 给我几个数学动脑筋的题目
- 55,22,52是中心对称图形吗
- 甲,乙两数的和是3.52,如果甲数的小数点向左移一位,就和乙数相等,甲,乙两数各
猜你喜欢