a) -3 1/2 – 2 1/4 b) 1/12 – ( -1/6 – 1/4) c) 2/5 + ( – 4/3 ) + ( -1/2) d) 1/3 – [ ( -5/4) – ( 1/4 + 3/8 ) ] 07/07/2021 Bởi Kennedy a) -3 1/2 – 2 1/4 b) 1/12 – ( -1/6 – 1/4) c) 2/5 + ( – 4/3 ) + ( -1/2) d) 1/3 – [ ( -5/4) – ( 1/4 + 3/8 ) ]
a) `-3 1/2 – 2 1/4` `=-7/2 – 9/4` `= -14/4 – 9/4` `=-23/4` `b) 1/12 – ( -1/6 – 1/4)` =` 1/12 – ( -2/12 – 3/12)` `= 1/12 – (-5/12)` `= 1/2` `c) 2/5 + ( – 4/3 ) + ( -1/2)` `= 6/15 +( -20/15 )+ (-1/2)` `=-14/15 +( -1/2)` `= -28/30 + (-15/30)` `=-43/30` `d) 1/3 – [ ( -5/4) – ( 1/4 + 3/8 ) ]` = `1/3 – [ (-5/4) – 5/8]` `= 1/3 – (-15/8)` `=8/24 – ( -15/24)` `= 53/24` Bình luận
`a, – 3 1/2 – 2 1/4` `= ( – 7 )/2 – 9/4` `= ( – 14 )/4 – 9/4` `= ( – 23 )/4` `b, 1/12 – ( – 1/6 – 1/4 )` `= 1/12 – ( – 2/12 – 3/12 )` `= 1/12 – ( – 5 )/12` `= 1/2` `c, 2/5 + ( – 4 )/3 + ( – 1 )/2` `= 24/60 + ( – 80 )/60 + ( – 30 )/60` `= ( – 56 )/60 + ( – 30 )/60` `= ( – 43 )/30` `d, 1/3 – [ ( – 5 )/4 – ( 1/4 + 3/8 )]` `= 1/3 – [ ( – 5 )/4 – ( 2/8 + 3/8 )]` `= 1/3 – [ ( – 5 )/4 – 5/8 ]` `= 1/3 – [ ( – 10 )/8 – 5/8 ]` `= 1/3 – ( – 15 )/8` `= 8/24 – ( – 45 )/24` `= 53/24` Bình luận
a) `-3 1/2 – 2 1/4`
`=-7/2 – 9/4`
`= -14/4 – 9/4`
`=-23/4`
`b) 1/12 – ( -1/6 – 1/4)`
=` 1/12 – ( -2/12 – 3/12)`
`= 1/12 – (-5/12)`
`= 1/2`
`c) 2/5 + ( – 4/3 ) + ( -1/2)`
`= 6/15 +( -20/15 )+ (-1/2)`
`=-14/15 +( -1/2)`
`= -28/30 + (-15/30)`
`=-43/30`
`d) 1/3 – [ ( -5/4) – ( 1/4 + 3/8 ) ]`
= `1/3 – [ (-5/4) – 5/8]`
`= 1/3 – (-15/8)`
`=8/24 – ( -15/24)`
`= 53/24`
`a, – 3 1/2 – 2 1/4`
`= ( – 7 )/2 – 9/4`
`= ( – 14 )/4 – 9/4`
`= ( – 23 )/4`
`b, 1/12 – ( – 1/6 – 1/4 )`
`= 1/12 – ( – 2/12 – 3/12 )`
`= 1/12 – ( – 5 )/12`
`= 1/2`
`c, 2/5 + ( – 4 )/3 + ( – 1 )/2`
`= 24/60 + ( – 80 )/60 + ( – 30 )/60`
`= ( – 56 )/60 + ( – 30 )/60`
`= ( – 43 )/30`
`d, 1/3 – [ ( – 5 )/4 – ( 1/4 + 3/8 )]`
`= 1/3 – [ ( – 5 )/4 – ( 2/8 + 3/8 )]`
`= 1/3 – [ ( – 5 )/4 – 5/8 ]`
`= 1/3 – [ ( – 10 )/8 – 5/8 ]`
`= 1/3 – ( – 15 )/8`
`= 8/24 – ( – 45 )/24`
`= 53/24`