tính: 1/24 + 2/25 + 3/26 3/2 + 4/3 + 5/4 + 3/10
2 câu trả lời
Lời giải:
`1/24 + 2/25 + 3/26`
`= 325/7800 + 624/7800 + 900/7800`
`= (325 + 624 + 900)/7800`
`= 1849/7800`
________________________________________
`3/2 + 4/3 + 5/4 + 3/10`
`= 90/60 + 80/60 + 75/60 + 18/60`
`= (90 + 80 + 75 + 18)/60`
`= 263/60`
$\text{$\dfrac{1}{24}$ + $\dfrac{2}{25}$ + $\dfrac{3}{26}$ }$
$\text{= $\dfrac{325+(312×2)+(300×3)}{7800}$}$
$\text{=$\dfrac{1849}{7800}$}$
$\text{$\dfrac{3}{2}$ + $\dfrac{4}{3}$ + $\dfrac{5}{4}$ + $\dfrac{3}{10}$}$
$\text{= $\dfrac{(3×30) + (4×20) + (5×15) + (3×6) }{60}$}$
$\text{=$\dfrac{263}{60}$}$
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