Question

tính bằng cách hợp lí: a) 3/4 x 6/7 x 16/3 x 42/6

Answer 1

\(\dfrac{3}{4}\times\dfrac{6}{7}\times\dfrac{16}{3}\times\dfrac{42}{6}\)

\(=\left(\dfrac{3}{4}\times\dfrac{16}{3}\right)\times\left(\dfrac{6}{7}\times\dfrac{42}{6}\right)\)

\(=4\times6\)

\(=24\)

Answer 2

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Answer 3

`3/4 xx 6/7 xx 16/3 xx 42/6`

`= (3/4 xx 16/3) xx (6/7 xx 42/6)`

`= 4 xx 6`

`=24`