Question

Answer 1

Câu 10: C

Câu 11: C 

Answer 2

10C
11C

Answer 3

Câu 10: C

Câu 11: C 

Answer 4

10D

11C

Answer 5

TL :

C 

C

Answer 6

\(12=2^2.3\)

\(15=3.5\)

\(18=2.3^2\)

\(BCNN\left(12;15;18\right)=2^2.3^2.5=180\)

\(=>D\)

Câu 11 :

C

Answer 7

10: 

\(12=2^2\cdot3\\ 15=3\cdot5\\ 18=2\cdot3^2\\ \Rightarrow BCNN\left(12;15;18\right)=2^2\cdot3^2\cdot5=4\cdot9\cdot5=180\\ D\)

11 : C

Answer 8

c

c