Gọi số học sinh là:x

Theo bài ra ta có:x+1 chia hết cho 2,4,6,5

\(\Rightarrow x+1\in BC\left(2,4,5,6\right)\)

Mà \(BCNN\left(2,4,5,6\right)=60\)

\(\Rightarrow x+1\in B\left(60\right)=\left\{60,120,180,240\right\}\)

\(\Rightarrow x\in\left\{59,119,179,239\right\}\)

Vì x chia hết cho 7 nên x=119

Vậy số học sinh là 119

1+1.2 = 1+2=3

ủng hộ nhé

12 giờ đó

đúng 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

3/ \(D=\left(x-2\right)\left(x-3\right)=x^2-5x+6=\left(x-\frac{5}{2}\right)^2-\frac{1}{4}\ge-\frac{1}{4}\)

min D = -1/4 khi x = 5/2

B=(....1)+12^4.503+2012                                                                                                                                                                        =(....1)+(.....6)+2012                                                                                                                                                                           =(.....9)                                                                                                                                                                                         vì 8:2 ma 9>8 1 đơn vị nên B sẽ chia 2 dư 1

bạn tran nguyen gia han trả lời nhầm câu hỏi rồi kìa