Question

(2/5*1/2)*5/8 làm bằng hai cách nha

Answer 1

c1

`(2/5xx1/2)xx5/8`

`=1/5xx5/8`

`=1/8`

c2

`(2/5xx1/2)xx5/8`

`=2/5xx1/2xx5/8`

`=(2/5xx5/8)xx1/2`

`=1/4xx1/2`

`=1/8`

Answer 2

`(2/5xx1/2)xx5/8`

`= 2/10 xx 5/8`

`=1/5 xx 5/8`

`= 5/40`

`=1/8`

__

`(2/5 xx 1/2) xx 5/8`

`=2/5 xx (1/2 xx 5/8)`

`= 2/5 xx 5/16`

`= 10/80`

`=1/8`

Answer 3

`(2/5xx1/2)xx5/8`

`=1/5xx5/8`

`=1/8`

__

`(2/5xx1/2)xx5/8`

`=2/5xx1/2xx5/8`

`=2/10xx5/8`

`=1/5xx5/8`

`=1/8`

Answer 4

\(C_1:\\ \left(\dfrac{2}{5}\cdot\dfrac{1}{2}\right)\cdot\dfrac{5}{8}=\dfrac{1}{5}\cdot\dfrac{5}{8}=\dfrac{1}{8}\\ C_2:\\ \left(\dfrac{2}{5}\cdot\dfrac{1}{2}\right)\cdot\dfrac{5}{8}=\dfrac{2}{5}\cdot\dfrac{1}{2}\cdot\dfrac{5}{8}=\left(\dfrac{2}{5}\cdot\dfrac{5}{8}\right)\cdot\dfrac{1}{2}=\dfrac{1}{4}\cdot\dfrac{1}{2}=\dfrac{1}{8}\)