Question

tính nhanh

a)\(\dfrac{6x8x15}{25x6x24}\)

b) 5/8 x 9/7 + 5/8 x 5/7

Answer 1

`a)=(6xx8xx5xx3)/(5xx5xx6xx3xx8)=(1)/5`

`b)=5/8xx(9/7+5/7)`

`=5/8xx2=10/8=5/4`

Answer 2

A,\(\dfrac{6x8x15}{25x6x24}=\dfrac{6x8x5x3}{5x5x6x3x8}=\dfrac{1}{5}\)

Answer 3

b) 5/8 x 9/7 + 5/8 x 5/7

= 5/8 x( 9/7 + 5/7)

= 5/8 x 14/7

= 5/8 x2

= 10/8

= 5/4