Question

Tính:

2x3x5

______
4x9x10

Answer 1

\(\dfrac{2\times3\times5}{4\times9\times10}\)

\(=\dfrac{2\times3\times5}{2\times2\times3\times3\times5\times2}\)

\(=\dfrac{1}{2\times3\times2}=\dfrac{1}{12}\)

Answer 2

a. 6 x 5 = 30 

b.4 x 9 x 10 = 36 x 10 = 360 

Answer 3

4×9×102×3×5​

=\dfrac{2\times3\times5}{2\times2\times3\times3\times5\times2}=2×2×3×3×5×22×3×5​

=\dfrac{1}{2\times3\times2}=\dfrac{1}{12}=2×3×21​=121​
 

Answer 4

1 phần 12