2 câu trả lời
(` -2/3 + 3/7 ) : 4/5 + ( -1/3 + 4/7 ) : 4/5`
`= ( -2/3 + 3/7 ). 5/4 + ( -1/3 + 4/7 ). 5/4`
`= ( -2/3 + 3/7 - 1/3 + 4/7 ). 5/4`
`= [ ( -2/3 - 1/3 ) + ( 3/7 + 4/7 ) ]. 5/4 `
`= ( -1 + 1 ). 5/4`
`= 0. 5/4`
`= 0`
(-2/3+3/7)\4/5+(-1/3+4/7)\4/5
= ( - 3/3 + 7/7 ) : 4/5
= ( -1+ 1) : 4/5
= 0 : 4/5
0
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