Ai làm xong trước mk tick cho nha

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Ai làm xong trước mk tick cho nha
ai-lam-ong-truoc-mk-tick-cho-nha

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Calantha 4 years 2020-10-16T10:50:31+00:00 1 Answers 80 views 0

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  1. Adela
    0
    2020-10-16T10:51:48+00:00
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    Bạn tham khảo :

    $1+2+3+…+10+x = 100$

    $(10 – 1) : 1 +1 . \dfrac{10+1}{2}  +x= 100$

    $10. \dfrac{11}{2} +x = 100$

    $\dfrac{10.11}{2}+x = 100$

    $55+x = 100$

    $x = 100 – 55$

    $x = 45$

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