A:took part in; joined
B:took part in ; joined i
C:joined in; took part i
D:joined; took part
- ______ your brother?
- He is a student.( )
已知关于x的不等式:|2x﹣m|≤1的整数解有且仅有一个值为2.
(Ⅰ)求整数m的值;
(Ⅱ)已知a,b,c∈R,若4a4+4b4+4c4=m,求a2+b2+c2的最大值.