e) 7 5/9 – ( 2 3/4 + 3 5/9) f) (1999/2011-2011/1999-12/2011) g) 4/19.-3/7 + (-3/7) . 15/19 + 5/7 h) -7/11.11/19+ -7/11.8/19+ -4/11 i) (-4/5+4/3) + (-5/4+14/5) -7/3
e) 7 5/9 – ( 2 3/4 + 3 5/9) f) (1999/2011-2011/1999-12/2011) g) 4/19.-3/7 + (-3/7) . 15/19 + 5/7 h) -7/11.11/19+ -7/11.8/19+ -4/11 i) (-4/5+4/3) + (-5/4+14/5) -7/3
Đáp án:
Giải thích các bước giải:
`e) 7 5/9 – ( 2 3/4 + 3 5/9)`
`= 68/9 – ( 11/4 + 32/9 )`
`= 68/9 – 227/36`
`= 5/4`
`f) (1999/2011- 2011/1999-12/2011)`
`= 0`
`g) 4/19.-3/7 + (-3/7) . 15/19 + 5/7`
`= -12/133 + (-45)/133 + 5/7`
`= -3/7 + 5/7`
` = 2/7 `
`h) -7/(11).(11)/19+ -7/(11).(8)/19+ -4/11`
` = -7/19 + (-56)/209 + (-4)/11 `
` = -1 `
`i) (-4/5+4/3) + (-5/4+14/5) -7/3`
` = 8/15 + 31/20 – 7/3 `
` = 25/12 – 7/3 `
` = -1/4 `