Bài `2`
`a ) 17,58 × 43 + 57 × 17,58`
`= 17,58 × ( 43 + 57 )`
`= 17,58 × 100`
`= 1758`
`b ) 43,57 × 2,6 × ( 630 - 315 × 2 )`
`= 43,57 × 2,6 × ( 630 - 630 )`
`= 43,57 × 2,6 × 0`
`= 0`
`c ) {45 × 16 - 17}/{45 × 15 + 28}`
`= {45 × ( 15 + 1 ) - 17}/{45 × 15 + 28}`
`= {45 × 15 + 45 - 17}/{45 × 15 + 28}`
`= {45 × 15 + 28}/{45 × 15 + 28}`
`= 1`
`d ) 104 × 68 - 36 × 52`
`= 104 × 68 - ( 36 : 2 ) × ( 52 × 2 )`
`= 104 × 68 - 18 × 104`
`= 104 × ( 68 - 18 )`
`= 104 × 50`
`= 5200`
`#dtkc`
