Question

Tính bằng cách thuận tiện nhất

Answer 1

\(\dfrac{4\times30}{8\times30}=\dfrac{4}{8}=\dfrac{1}{2}\)

Answer 2

= \(\dfrac{4x5x3x2}{3x4x2x5x2}\)

=\(\dfrac{2}{2x2}\)

=\(\dfrac{2}{4}=\dfrac{1}{2}\)

Answer 3

b) \(\dfrac{4\times5\times6}{3\times8\times10}\)

\(=\dfrac{2\times2\times5\times2\times3}{3\times2\times4\times2\times5}\)

\(=\dfrac{2}{4}\)

\(=\dfrac{1}{2}\)

Answer 4

`(4 xx 5 xx 6)/(3 xx 8 xx 10)`

`= (2 xx 2 xx 5 xx 3 xx 2)/(3 xx 2 xx 4 xx 2 xx 5)`

`= (cancel{2} xx cancel{2} xx cancel{5} xx cancel{3} xx 2)/(cancel{3} xx cancel{2} xx 4 xx cancel{2} xx cancel{5})`

`= 2/4 = 1/2`

Answer 5

= 4 x 5 x 2 x 3 / 3 x 2 x 4 x 2 x 5

= 1/2

Answer 6

= 4 x 5 x 2 x 3 / 3 x 2 x 4 x 2 x 5

= 1/2

Answer 7

\(\dfrac{4x5x6}{3x8x10}\)= \(\dfrac{2x2x5x2x6}{3x2x4x2x5}\) = \(\dfrac{2}{4}\) = \(\dfrac{1}{2}\)