`M = (2 - 5/4 + 1/8) : ( 2/3 + 5/12 - 1)`
`= ( 16/8 - 10/8 + 1/8) : ( 8/12 + 5/12 - 12/12)`
`= 7/8 : 1/12`
`= 7/8 . 12`
`= 21/2`
Vậy `M = 21/2`
``
`N = ( 2 1/3 + 3 1/2) : (-4 1/6 + 3 1/7) + 7 1/2`
`= ( 7/3 + 7/2): (-25/6 + 22/7) + 15/2`
`= ( 14/6 + 21/6) : (-175/42 + 132/42) + 15/2`
`=35/6 : (-43)/42 + 15/2`
`=-245/43 + 15/2`
`= -490/86 + 645/86`
`= 155/86`
Vậy `N = 155/86`
``
`H = ( 0,645 : 0,3 - 1 17/150) : ( 4 : 6,25 - 1/5+ 1/7 . 1,96) - 11,125`
`= (2,15 - 167/150) : ( 0,64 - 1/5 + 0,28) - 11,125`
`=( 43/20 - 167/150) : ( 16/25 - 1/5 + 7/25) - 89/8`
`= 311/300 : 18/25 - 89/8`
`= 311/216 - 89/8`
`=-523/54`
Vậy `H = -523/54`
`#caty09`