Đáp án:
`Azzuri#`
`i)`
`(-4/5 + 4/3) + (-5/4 + 14/5) - 7/3`
`= -4/5 + 4/3 - 5/4 + 14/5 - 7/3`
`= (-4/5 + 14/5) + (4/3 - 7/3) - 5/4`
`= 2 + (-1) - 5/4`
`= 1 - 5/4`
`= -1/4`
`j)`
`8/3 . 2/5 . 3/8 . 10 . 10/92`
`= ( 8/3 . 3/8) . ( 2/5 . 10/92) . 10`
`= 1 . 1/23 . 10`
`= 10/23`
`k)`
`-5/7 . 2/11 + (-5/7) . 9/14+ 12/7`
`= -5/7 . ( 2/11 + 9/14) + 12/7`
`= -5/7 . 71/154 + 12/7`
`= -355/1078 + 12/7`
`= 1593/1078`
`l)`
`12/19 . 7/15 . (-13/17) . 19/12 . 17/13`
`= (12/19 . 19/12) . ( -13/17 . 17/13) . 7/15`
`= 1 . (-1) . 7/15`
`= -7/15`
Giải thích các bước giải: