Tính thuận tiện: a) 19/37 + (1 – 19/37) b) 9/8 – (17/7 – 3/7) + 7/8 03/09/2021 Bởi Madelyn Tính thuận tiện: a) 19/37 + (1 – 19/37) b) 9/8 – (17/7 – 3/7) + 7/8
a) 19/37 + (1 – 19/37) = 19/37 + 1 – 19/37 = 19/37 – 19/37 + 1 = 0 + 1 = 1 b) 9/8 – (17/7 – 3/7) + 7/8 = 9/8 – 17/7 + 3/7 + 7/8 = (9/8 + 7/8) – (17/7 – 3/7) = 16/8 – 14/7 = 133/56 – 22/56 = 111/56 Bình luận
`a, 19/37 + ( 1 – 19/37 )` `= 19/37 + 1 – 19/37` `= ( 19/37 – 19/37 ) + 1 ` `= 0 + 1` `= 1` `b, 9/8 – ( 17/7 – 3/7 ) + 7/8` `= ( 9/8 + 7/8 ) – 2` `= 2 – 2` `= 0` Bình luận
a) 19/37 + (1 – 19/37)
= 19/37 + 1 – 19/37
= 19/37 – 19/37 + 1
= 0 + 1
= 1
b) 9/8 – (17/7 – 3/7) + 7/8
= 9/8 – 17/7 + 3/7 + 7/8
= (9/8 + 7/8) – (17/7 – 3/7)
= 16/8 – 14/7
= 133/56 – 22/56
= 111/56
`a, 19/37 + ( 1 – 19/37 )`
`= 19/37 + 1 – 19/37`
`= ( 19/37 – 19/37 ) + 1 `
`= 0 + 1`
`= 1`
`b, 9/8 – ( 17/7 – 3/7 ) + 7/8`
`= ( 9/8 + 7/8 ) – 2`
`= 2 – 2`
`= 0`