Đáp án:
$\\$
`a,`
`(5/11 - 3/7 + 4) - (4/7+16/11 - 2)`
`= 5/11 -3/7 + 4 - 4/7 -16/11+2`
`= (5/11-16/11) + (-3/7 - 4/7) + (4+2)`
`= -1 - 1 + 6`
`= -2 + 6`
`= 4`
`b,`
`3/47 + 3/710 + 3/37 × 43`
`= 3/47 + 3/710 + 129/37`
`= (3×26270)/(47 × 26270) + (3 × 1739)/(710 × 1739) + (129 × 33370)/(37 × 33370)`
`= 78810/1234690 + 5217/1234690 + 4304730/1234690`
`= (78810 + 5217 + 4304730)/1234690`
`= 4388757/1234690`
