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

Toán Lớp 7: A= 2 $^{100}$ – 2 $^{99}$ + 2 $^{98}$ – 2 $^{97}$ + …+ 2 $^{2}$ – 2 Mn làm trong giấy rồi chụp giúp mình nhé

Toán Lớp 7: A= 2 $^{100}$ – 2 $^{99}$ + 2 $^{98}$ – 2 $^{97}$ + …+ 2 $^{2}$ – 2
Mn làm trong giấy rồi chụp giúp mình nhé

Comments ( 2 )

  1. A = 2^100 – 2^99 + 2^98 – 2^97 + …. + 2^2 – 2
    2A = 2^101 – 2^100 + 2^99 – 2^98 + …. + 2^3 – 2^2
    2A + A = ( 2^101 – 2^100 + 2^99 – 2^98 + …. + 2^3 – 2^2 ) + ( 2^100 – 2^99 + 2^98 – 2^97 + …. + 2^2 – 2 )
    3A = 2^101 – 2
    A = ( 2^101 – 2 ) : 3
    A = ( 2^101 – 2 )/3  

  2. Giải đáp+Lời giải và giải thích chi tiết:
    A=2^100-2^99+2^98-2^97+. . .+2^2-2$\\$=>2A=2^101-2^100+2^99-2^98+. . .+2^3-2^2$\\$=>2A+A=2^101-2$\\$=>3A=2^101-2$\\$=>A=(2^101-2)/3

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