如果2,3,8,x四个数的平均数是3,那么x的值是______.
∵四个数的平均数是3,
∴(2+3+8+x)÷4=3,
∴x=12-2-3-8=-1.
故答案为-1.
根据句意和汉语提示,写出单词
1. Go and find out what's happened and _____ (报告) back to me!
2. Are you a _____ (成员) of the tennis club?
3. It's no use tying (捆) it. You'll have to _______(粘) it.
4. Jack is a famous lawyer in his own ________(领域).
5. I must _______ (安排) my life better.
装煤水分为()时,堆密度最小。
A.9~10%
B.7~8%
C.11~15%