`2/3`+`-1/3`.`7/8` -`(`3/17`+`2/13`)`-`(`-20/17`+`11/13`)`
2 câu trả lời
`2/3 + (-1/3) . 7/8`
`= 2/3 + (-1.7)/(3.8)`
`= 2/3 + (-7/24)`
`= 16/24 + (-7/24)`
`= 9/24 = 3/8`
`-------`
`-(3/17 + 2/13) - (-20/17 + 11/13)`
`= -3/17 - 2/13 + 20/17 - 11/13`
`= (-3/17 + 20/17) - 2/13 - 11/13`
`= (-1) +1`
`=0`
`2/3 + (-1/3).7/8`
`= 2/3 + (-1.7)/(3.8)`
`= 2/3 + (-7/24)`
`= 2/3 - 7/24`
`= 3/8`
`-(3/17+2/13)-(-20/17+11/13)`
`= -73/221 -(-73/221)`
`=0`
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