题干
____ (根据……判断) his appearance, he is about 40 years old.
答案(点此获取答案解析）
Judging from
____ (根据……判断) his appearance, he is about 40 years old.
的展开式中，各项系数之和为A,各项二项式系数之和为B,
,则展开式中常数项的值为
