Bài 6:
`a. 1122. 34 + 2244 . 83`
` = 1122 . 34 + 1122. 2 . 83`
` = 1122. (34 + 2.83)`
` = 1122. 200`
` = 224400`
`b. 68. 24 + 34. 52`
` = 34 . 2 . 24 + 34 . 52`
` = 34 . (2.24 + 52)`
` = 34 . 100`
` = 3400`
`c. 6688.59+3344.82`
` = 3344 . 2 . 59 + 3344. 82`
` = 3344 . 118 + 3344 . 82`
` = 3344 . (118 + 82)`
` = 3344 . 200`
` = 668800`
`d. 1133.48+3399.84`
` = 1133 . 48 + 1133 . 3 . 84`
` = 1133 . 48 + 1133. 252`
` = 1133 . (48 + 252) `
` = 1133 . 300`
` = 339900`
`e. 44 . 146 - 88 . 23`
` = 44 . 146 - 44 . 2 . 23`
` = 44. 146 - 44 . 46`
` = 44 . (146 - 46)`
` = 44. 100 = 4400`
`f.888.121-222.84`
` = 222. 4 . 121 - 222 . 84`
` = 222. 484 - 222 . 84`
` = 222 . (484 - 84)`
` = 222 . 400`
`= 88800`