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Tập hợp nghiệm của bất phương trình ∫ 0 x t t 2 + 1 d t > 0  (ẩn x) là

A.  - ∞ ;   0

B.  - ∞ ;   + ∞

C.  - ∞ ;   + ∞   \   0

D.  0 ;   + ∞

sao lai khong phai tong

cho người A cầm đuốc

lượt 1: A đi với B tổng cộng 2 phút

A qua cầu lại 1 phút

lượt 2: A đi với C tổng cộng 7 phút

A qua cầu lại 1 phút

lượt 3: A đi với D tổng cộng 10 phút

vậy hết: 2 + 1 + 7 + 1 + 10 = 21 phút

ko chắc

Ta có : 1 tuần 2 ngày =9 ngày, 1 tuần 3 ngày là :10 ngày.

 Vậy an thăm ông bà tất cả là :9+10=19(ngày)

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