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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: B=1+5+5^2+5^3+…+5^150 Giúp mik vs ,mik đg cần gấp

Toán Lớp 6: B=1+5+5^2+5^3+…+5^150
Giúp mik vs ,mik đg cần gấp

Comments ( 2 )

  1. B = 1 + 5 + 5^{2} + .. + 5^{150}
    5B = 5 . (1 + 5 + 5^{2} + .. + 5^{150})
    5B = 5 + 5^{2} + 5^{3} + .. + 5^{151}
    5B – B = (5 + 5^{2} + 5^{3} + .. + 5^{151}) – (1 + 5 + 5^{2} + .. + 5^{150})
    4B = 5^{151} – 1
    B = {5^{151} – 1}/4
    $\text{Vậy}$ B = {5^{151} – 1}/4
     

  2. B=1+5+5^2+5^3+…+5^150
    5B=5+5^2+5^3+5^4+…+5^151
    5B-B=(5+5^2+5^3+5^4+…+5^151)-(1+5+5^2+5^3+…+5^150)
    4B=5^151 -1
    B=(5^151 -1)/4

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222-9+11+12:2*14+14 = ? ( )

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