Tính
`2 3/8 - 1 1/4 + 5 1/3`
`=19/8 - 5/4 + 16/3`
`=57/24 - 30/24 + 128/24`
`=\frac{57-30 + 128}{24}`
`= 155/24`
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tìm x
`x + 2 3/4 = 5 2/3`
`x + 11/4 = 17/3`
`x = 17/3 - 11/4`
`x = 68/12 - 33/12`
`x = 35/12`
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`x - 1 4/5 = 3 2/7`
`x - 9/5 = 23/7`
`x = 23/7 + 9/5`
`x =115/35+ 63/35`
`x = 178/35`
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`x + 1/2 xx 1/3 = 3/4`
`x + 1/6 = 3/4`
`x = 3/4 - 1/6`
`x = 9/12 - 2/12`
`x = 7/12`
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`5 2/3 : x = 3 2/3 - 2 1/2`
`17/3 : x = 11/3 - 5/2`
`17/3 : x = 22/6 - 15/6`
`17/3 : x = 7/6`
`x = 17/3 : 7/6`
`x = 17/3 . 6/7`
`x = 34/7`
