Bài làm
Gọi số học sinh nhập học năm nay của trường THCS là x (em)

Theo đề bài, ta có
x⋮6 , x⋮8 , x⋮10 , x⋮12 , 450≤x≤500

nên x ∈ BC(6,8,10,12)
6=2.3 8=\(2^3\) 10=2.5 12=\(2^2\) .3

BCNN(6,8,10,12)=\(2^3\) .3.5=120
BC(6,8,10,12)=B(120)={0,120,240,360,480,600,...}
Vì 450≤x≤500 nên x=480
Vậy trường THCS có 480 học sinh nhập học năm nay.

6

C

9 bạn thích học nhảy nha

B

2

14

1011030

4cm

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