Đáp án + Giải thích các bước giải:
`(1/6 + 1/39 + 1/51)/(1/8 - 1/52 + 1/68).`
`= (13/78 + 2/78 + 1/51)/(13/104 - 2/104 + 1/68).`
`= (15/78 + 1/51)/(11/104 + 1/68).`
`= (281/1326)/(213/1768).`
`= 281/1326 : 213/1768.`
`= 281/1326 × 1768/213.`
`= (281×1768)/(1326×213).`
`= 496808/282438.`
`= (496808:442)/(282438:442).`
`= 1124/639.`
Vậy `(1/6 + 1/39 + 1/51)/(1/8 - 1/52 + 1/68) = 1124/639.`
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