Question

tính bằng cách thuận tiện

\(4\cdot25\cdot0,25\cdot\dfrac{1}{5}\cdot\dfrac{1}{2}\cdot2=?\)

Answer 1

4x25x0,25x1/5x1/2x2

=4x25x0,25x0,2x0,5x2

= (4x25)x(0,5x1)x(0,25x0,2)

=    100  x 1        x 0,05

=      100x0,05

= 5

Answer 2

`4.25.0,25. 1/5 . 1/2 . 2`

`=4.25. 1/4 . 1/5 . 1/2 . 2`

`=(4. 1/4).(25. 1/5).(1/2 .2)`

`=1.5.1=5`

Answer 3

\(=\left(4\cdot\dfrac{1}{4}\right)\cdot\left(\dfrac{1}{2}\cdot2\right)\cdot\left(25\cdot\dfrac{1}{5}\right)=5\)

Answer 4

Answer 5

5