Đáp án:
Bài 1:
`a, 7/15 - 3/2 . (-4)/5 + (-1)/5`
`=7/15 + 6/5-1/5`
`=7/15 + (6/5-1/5)`
`= 7/15 + 1 `
`= 22/15`
`b, 1/2+(-3)/5:(-1 1/2)-|(-2)/5|`
`= 1/2+(-3)/5:(-3)/5-2/5`
`= 1/2+1-2/5`
`= 3/2-2/5`
`= 11/10`
Bài 2:
`a, 4/9-14/35-(21/35-5/9-0,5)`
`= 4/9-14/35-21/35+5/9+1/2`
`= (4/9+5/9)-(14/35+21/35)+1/2`
`= 1-1+1/2`
`= 1/2`
`b, 4/3 . (-1)/5+1/3 . (-6)/5`
`= (-4)/15 + (-6)/15`
`= (-(4+6))/15`
`= (-10)/15`
`= (-2)/3`
