Câu 2 :
B : 12 vì 12 chia hết cho 2,3 và 4
Câu 3 :
\(\dfrac{5}{3};\dfrac{3}{3};\dfrac{4}{3};\dfrac{8}{12}\)
\(\dfrac{5}{3}=\dfrac{5\times4}{3\times4}=\dfrac{20}{12};\dfrac{3}{3}=\dfrac{3\times4}{3\times4}=\dfrac{12}{12};\dfrac{4}{3}=\dfrac{4\times4}{3\times4}=\dfrac{16}{12};\dfrac{8}{12}\)
Chọn D
Câu 4 :
\(\dfrac{2}{3};\dfrac{3}{4};\dfrac{4}{6};\dfrac{5}{12}\)
\(\dfrac{2}{3}=\dfrac{2\times4}{3\times4}=\dfrac{8}{12};\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12};\dfrac{4}{6}=\dfrac{4\times2}{6\times2}=\dfrac{8}{12};\dfrac{5}{12}\)
Chọn B
Câu 5 :
\(\dfrac{180}{252}=\dfrac{180:36}{252:36}=\dfrac{5}{7}\)
Chọn C
Đúng 3
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