Đáp án:
g, `7/8 . (-5/9) - 7/8 . 4/9 + 5 7/8`
`= 7/8 . ( -5/9 - 4/9) + 5+ 7/8`
` = 7/8 . (-1) + 5 + 7/8`
`= -7/8 + 5 + 7/8 = (7/8 - 7/8) + 5`
`= 0 + 5 = 5`
h, `-1/4 . 13 9/11 - 0,25 . 6 2/11`
`= 1/4 . (-13 9/11) - 1/4 . 6 2/11`
` = 1/4 . ( -13 9/11 - 6 2/11)`
` = 1/4 . (-20) = -5`
k, `3/(5 . 7) + 3/( 7 . 9) + .......... +3/(59 . 61)`
`=1/5 - 1/7 + 1/7 - 1/9 + ........... + 1/59 - 1/61`
`=1/5 - 1/61 = 61/305 - 5/305`
`= 56/305`
l, `75% - 1 1/2 + 0,5 : 5/12`
` = 3/4 - 3/2 + 1/2 . 12/5`
`= 3/4 - 6/4 + 6/5`
`= -3/4 + 6/5`
`= -15/20 + 24/ 20 = 9/20`
n, `(20% - 1,4) . (-5)^2 - ( 1 1/5 - 1/5) . 0,5`
`= ( 0,2 - 1,4) . 25 - 1 . 0,5`
` = -1,2 . 25 - 0,5`
` = -30 - 0,5 =-30,5`
`text{ @toanisthebest}`
