2-1+4-3+6-5+…+28-27:30_29

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2-1+4-3+6-5+…+28-27:30_29

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Thanh Thu 5 years 2021-04-18T06:42:12+00:00 2 Answers 19 views 0

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  1. Gerda
    0
    2021-04-18T06:43:30+00:00
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    2-1+4-3+6-5+…+28-27:30-29

    =(2-1)+(4-3)+…..+(28-29)-(27:30)

    =  1 + 1  +  …   +(-1)   –  $\frac{9}{10}$ (có 13 sô 1)

    =   13 + (-1)  –  $\frac{9}{10}$

    =    12 – $\frac{9}{10}$

    =   $\frac{111}{10}$ 

     

  2. bonexptip
    0
    2021-04-18T06:44:09+00:00
    Reply

    `2-1+4-3+6-5+…28-27:30-29`

    `=(2-1)+(4-3)+(6-5)+…(28-29)27:30`

    `=1+1+1+….+(-1)-9/10`

    `=12-9/10`

    `=111/10`

    Xin hay nhất ạ.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )