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Mathematics

9th -

10thgrade

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Progresii aritmetice 9E pt antrenament

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Cristina Măgirescu

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6 questions

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  • 1. Fill in the Blank
    30 seconds
    1 pt

    Se consideră progresia aritmetică

     (an)n≥1\left(a_n\right)_{n\ge1}  în care  a1=2a_1=2  și r= -3. Termenul  a8a_8  este egal cu:

  • 2. Fill in the Blank
    1 minute
    1 pt

    Se consideră progresia aritmetică  (an)n≥1\left(a_n\right)_{n\ge1}  în care  a3=11a_3=11  și  a7=3a_7=3  . Valoarea termenului  a11a_{11}  este:

  • 3. Multiple Choice
    3 minutes
    1 pt

    Fie progresia aritmetică  (an)n≥1\left(a_n\right)_{n\ge1} în care  a3+a19=10a_3+a_{19}=10  . Valoarea sumei  a6+a16a_6+a_{16}   este:

    20

    10

    5

    25

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