A cj ơi e đg cần gấp 2h e hc ròi , giúpp e nha :3

Đáp án`+`Giải thích các bước giải:

` 6) 9/100 . 23/101 + 9/100 . 81/101 - 4/100 . 9/101 `

` = 9/100 . (23/101 + 81/101) - 4/100 . 9/101 `

` = 9/100 . 104/101 - 4/100 . 9/101 `

` = 234/2525 - 9/2525 `

` = {234 - 9}/2525 `

` = 225/2525 `

` = 9/101 `

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` 7) (5/4 - 2/5) . 2022/2023 + (3/4 - 3/5) . 2022/2023 `

` = [(5/4 - 2/5) + (3/4 - 3/5)] . 2022/2023 `

` = [17/20 + 3/20] . 2022/2023 `

` = 1 . 2022/2023 `

` = 2022/2023 `

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` 8) (1/4 - 2/5) : 3/8 + (3/4 - 8/5) : 3/8 `

` = (1/4 - 2/5) . 8/3 + (3/4 - 8/5) . 8/3 ` 

` = [(1/4 - 2/5) + (3/4 - 8/5)] . 3/8 `

` = [(-3/20) + (-17/20)] . 3/8 `

` = (-1) . 3/8 `

` = -3/8 `

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` 9) (1/3 - 3/10) : 3/5 + (2/3 - 7/10) : 3/5 `

` = (1/3 - 3/10) . 5/3 + (2/3 - 7/10) . 5/3 `

` = [(1/3 - 3/10) + (2/3 - 7/10)] . 5/3 `

` = [1/30 + (-1/30)] . 5/3 `

` = 0 . 5/3 `

` = 0 `

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` 10) 21 1/5 : (-5/2) - 16 1/5 : (-5/2) `

` = 106/5 . (-2/5) - 81/5 . (-2/5) `

` = (106/5 - 81/5) . (-2/5) `

` = 5 . (-2/5) `

` = -2 `

` tt (@NgManh06) `