a) 5 + 8 + 11 +14 +…+ 302 b) 7 + 11 + 15 + 19 +…+ 203

Question

a) 5 + 8 + 11 +14 +…+ 302
b) 7 + 11 + 15 + 19 +…+ 203

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Athena 2 tháng 2021-10-01T10:46:36+00:00 2 Answers 10 views 0

Answers ( )

    0
    2021-10-01T10:47:42+00:00

    $\begin{array}{l}
    a)\,\,\,A = 5 + 8 + 11 + 14 + + ….. + 302\\
    Ta\,\,thay\,\,A\,\,la\,\,tong\,\,cua\,\,cac\,\,so\,\,cach\,\,nhau\,\,3\,\,don\,\,vi.\\
    So\,\,cac\,\,so\,\,hang\,\,cua\,\,A:\,\,\,\,\left( {302 – 5} \right):3 + 1 = 100.\\
    \Rightarrow A = \left( {302 + 5} \right).100:2 = 15350.\\
    b)\,\,\,B = 7 + 11 + 15 + 19 + …. + 203\\
    Ta\,\,thay\,\,B\,\,la\,\,tong\,\,cua\,\,cac\,\,so\,\,cach\,\,nhau\,\,4\,\,don\,\,vi.\\
    So\,\,cac\,\,so\,\,hang\,\,cua\,\,B:\,\,\,\,\left( {203 – 7} \right):4 + 1 = 50.\\
    \Rightarrow A = \left( {203 + 7} \right).50:2 = 5250.
    \end{array}$

    0
    2021-10-01T10:48:15+00:00

    a) SSH: (302-5) /3+1 =100

    Tổng: (302+5) * 100/2= 15350

    b)SSH: (203-7)/4+1= 50

    Tổng: (203+7) *50/2 =5250

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