Trang chủ » Hỏi đáp » Môn Toán 1/99 – 1/99.98 – 1/98.97 – 1/97.96 – … – 1/3.2 – 1/2.1 26/12/2024 1/99 – 1/99.98 – 1/98.97 – 1/97.96 – … – 1/3.2 – 1/2.1
Giải đáp: 1/99-1/99.98-1/98.97-1/97.96-…-1/3.2-1/2.1 =1/99-(1/99.98+1/98.97+1/97.96-…-1/3.2+1/2.1) =1/99-(1/1.2+1/2.3+…+1/96.97+1/97.98+1/98.99) =1/99-(1-1/2+1/2-1/3+…+1/96-1/97+1/97-1/98+1/98-1/99) =1/99-(1-1/99) =1/99-98/99 =(-97)/99 Trả lời
1/99 – 1/99.98 – 1/98.97 – 1/97.96 – …. – 1/3.2 – 1/2.1 = 1/99 – ( 1/1.2 + 1/2.3 + …. + 1/97.98 + 1/98.99 ) = 1/99 – ( 1 – 1/2+ 1/2 – 1/3 + …. + 1/97 – 1/98 + 1/98 – 1/99 ) = 1/99 – ( 1 – 1/99 ) = 1/99 – ( 99/99 – 1/99 ) = 1/99 – 98/99 = -97/99 Trả lời
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