Đáp án+Giải thích các bước giải:
h) `-7/25 * 39/-14 * 50/78`
`= ((-7)*39*50)/(25*(-14)*78)`
`= 1/2`
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i) `(3/8 + (-3)/4 + 7/12) : 5/6 + 1/2`
`= (9/24 + (-18)/24 + 14/24) : 5/6 + 1/2`
`= 5/24 : 5/6 + 1/2`
`= 1/4 + 1/2`
`= 3/4`
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j) `(-3)/4 + 2/7 + (-1)/4 + 3/5 + 5/7`
`= ((-3)/4 + (-1)/4) + (2/7 + 5/7) + 3/5`
`= -1 + 1 + 3/5`
`= 0 + 3/5`
`= 3/5`
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k) `(-2)/17 + 15/23 + (-15)/17 + 4/19 + 8/23`
`= ((-2)/17 + (-15)/17) + (15/23 + 8/23) + 4/19`
`= -1 + 1 + 4/19`
`= 0 + 4/19`
`= 4/19`
