Toán Lớp 6: Rút gọn biểu thức:
2S=2+2^2+2^3+…+2^101
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Toán Lớp 6: Rút gọn biểu thức:
2S=2+2^2+2^3+…+2^101
Comments ( 2 )
S=(2:2)+(2^2:2)+(2^3:2)+…+(2^101:2)
S=1+2+2^2+…+2^100
2S-S=(2+2^2+2^3+…+2^101)-(1+2+2^2+…+2^100)
S=2^101-1
Vậy S=2^101-1