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`
$\dfrac{7}{25}$ × $\dfrac{11}{13}$ + $\dfrac{2}{13}$ + $\dfrac{18}{25}$
= $\dfrac{77}{325}$ + $\dfrac{2}{13}$ + $\dfrac{18}{25}$
= $\dfrac{77}{325}$ + $\dfrac{50}{325}$ + $\dfrac{234}{325}$
= $\dfrac{122}{325}$ + $\dfrac{234}{325}$
= $\dfrac{361}{325}$
Câu hỏi trong lớp
Xem thêm
