

Thực hiện phép tính
a)11/24-5/41+13/24-36/41
b) (-34,5).11/25-65,6.11/25
c) -5/17.31/33+-5/17.2/33+2,5/17
d) (1/3+12/67+13/41)-(79/67-28/41)
e) (-3/7+5/11).5/3+(6/11-4/7).5/3
f) 3/5 : -7/30+3/5:-7/5
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`a ) 11/24 − 5/41 + 13/24 − 36/41`
`= ( 11/24 + 13/24 ) + ( − 5/41 − 36/41 )`
`= 24/24 − 41/41`
`= 1 − 1`
` = 0 `
`b ) ( − 34 , 5 ) . 11/25 − 65 , 6 . 11/25`
`= ( − 34 , 5 − 65 , 6 ) . 11/25`
`= − 100 , 1 . 11/25`
`= − 1101/25`
`= − 44 , 04`
`c ) ( − 5/17 ) . ( 31/33 ) + ( − 5/17 ) . ( 2/33 ) + (2,5)/17`
`= ( − 5/17 ) . ( 31/33 + 2/33 ) + (2 , 5)/17`
`= ( − 5/17 ) . ( 33/33 ) + (2 , 5)/17`
`= − 5/17 + (2 , 5)/17`
`= − 5 34`
d ) ( 1/3 + 12/67 + 13/41 ) − ( 79/67 − 28/41 )`
`= 1/3 + 12/67 + 13/41 − 79/67 + 28/41`
`= 1/3 + ( 12/67 + − 79/67 ) + ( 28/41 + 13/41 )`
`= 1/3 + ( − 1 ) + 1`
`= 1/3`
`e ) ( − 3/7 + 5/11 ) . 5/3 + ( 6/11 − 4/7 ) . 5/3`
` = 2/77 . 5/3 + ( − 2/77 ) . 5/3`
`= ( − 2/77 + 2/77 ) . 5/3`
`= 0 . 5/3`
`= 0`
`f ) 3/5 ÷ ( − 7/30 ) + 3/5 ÷ ( − 7/5 )`
`= 3/5 . ( − 30/7 ) + 3/5 ⋅ ( − 5/7 )`
`= 3/5 . (-30/7 + -5/7)`
`= 3/5 . (-5)`
`= -3`
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