中3~Laws of Indices[要列式] @ oob73zj92b的部落格

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中3~Laws of Indices[要列式]

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3,,,The memory capacity of the harddisk in May's computer is 8.5x10^8 byte.The files stored include 3.3x10^8, 8.4*10^7, 2.5x10^7, 8.2x10^6, 1.6x10^6, 3.0x10^8a, How much space is left in May's harddisk?[1.012x10^8]b, May sends her files[1.6x10^6] to David. It takes 2.1x10^-5 second to send one... 顯示更多 3,,,The memory capacity of the harddisk in May's computer is 8.5x10^8 byte.The files stored include 3.3x10^8, 8.4*10^7, 2.5x10^7, 8.2x10^6, 1.6x10^6, 3.0x10^8 a, How much space is left in May's harddisk?[1.012x10^8] b, May sends her files[1.6x10^6] to David. It takes 2.1x10^-5 second to send one byte. How long does it take to send the files[1.6x10^6] to David?[33.6s]

最佳解答:

3a the used capacity =(3.3x10^8)+ (8.4x10^7)+( 2.5x10^7)+( 8.2x10^6)+( 1.6x10^6)+(3.0x10^8) =10^6[3.3x100+8.4x10+2.5x10+8.2+1.6+3x100] =10^6(330+84+25+8.2+1.6+300) =10^6(748.8) =10^6(7.488x10^2) =7.488 x 10^8 so the space is left in May's harddisk =8.5x10^8 - 7.488x10^8 =10^8(8.5-7.488) =1.012 x 10^8 byte b it take =(1.6x10^6) x (2.1x10^-5) =(1.6x2.1) x (10^6x10^-5) =3.36 x10^(6-5) =3.36 x 10 =33.6 so it take 33.6s to send the files

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