12 + 13 + 14 +15 + 16 +17 +18 + 19 + 20 =

Question

12 + 13 + 14 +15 + 16 +17 +18 + 19 + 20 =

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Elliana 4 tuần 2021-11-17T07:04:30+00:00 2 Answers 4 views 0

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    0
    2021-11-17T07:06:06+00:00

    $12+13+14+15+16+17+18+19+20$

    $= (12+18)+(13+17)+(14+16) + (20+15) + 19$

    $=  30+30+30+35+19$

    $= 125+19$

    $= 144$ 

     

    0
    2021-11-17T07:06:12+00:00

    Đáp án:

     `=144`

    Giải thích các bước giải:

    `12 + 13 + 14 +15 + 16 +17 +18 + 19 + 20 `

    `=(12+18)+(13+17)+(14+16)+(15+20)+19`

    `=30+30+30+15+20+19`

    `=(30+30+30+20)+15+19`

    `=110+15+19`

    `=125+19`

    `=144`

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