Đáp án:
`5/8 - 2/8 = (5-2)/8 = 3/8`
`6/18 × 6/24 = (6×6)/(18×24) = (\cancel6×\cancel6)/(\cancel18×\cancel24) = (1×1)/(3×4) = 1/12`
`17/18 : 5/6 = 17/18 × 6/5 = (17×6)/(18×5) = (17×\cancel6)/(\cancel18×5) = (17 × 1 )/(3×5) = 17/15`
` 5/9-1/4 = 20/36 - 9/36 = (20-9)/36 = 11/36 `
`3: 2/7 = (3 × 7)/2 = 21/2 `
`5/(6×5) = \cancel5/(6×\cancel5) = 1/6`
`4+21/17 = 68/17 + 21/17 = (68+21)/17 = 89/17`
`9-4/11 = 99/11 - 4/11 = (99-4)/11 = 95/11`
`Go od luck!`