tính một cách hợp lý 7/25.11/13+2/13+18/25

2 câu trả lời

Đề `1:`

`7/25 + 11/13 + 2/13 + 18/25`

`= (7/25 + 18/25) + (11/13 + 2/12)`

`= 1 + 1`

`= 2`

Đề `2:`

`7/25 . 11/13 + 2/13 + 18/25`

`= 77/325 + 2/13 + 18/25`

`= 127/324 + 18/25`

`= 361/325`

$\dfrac{7}{25}$ × $\dfrac{11}{13}$ + $\dfrac{2}{13}$ + $\dfrac{18}{25}$

= $\dfrac{77}{325}$ + $\dfrac{2}{13}$ + $\dfrac{18}{25}$

= $\dfrac{77}{325}$ + $\dfrac{50}{325}$ + $\dfrac{234}{325}$

= $\dfrac{122}{325}$ + $\dfrac{234}{325}$

= $\dfrac{361}{325}$

 

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