a ) 100 + 98 + 96 + ….+ 2 – 97 – 95 – …..-1 b) 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9 + 10 – 11 – 12 + ….. – 299 – 330 + 301 + 302 c) (98. 7676 –

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a ) 100 + 98 + 96 + ….+ 2 – 97 – 95 – …..-1
b) 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9 + 10 – 11 – 12 + ….. – 299 – 330 + 301 + 302
c) (98. 7676 – 9898. 76 ) + (2001.2002.2003. … 2017)

0 bình luận về “a ) 100 + 98 + 96 + ….+ 2 – 97 – 95 – …..-1 b) 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9 + 10 – 11 – 12 + ….. – 299 – 330 + 301 + 302 c) (98. 7676 –”

  1. a, 100 + 98 + 96 + ….+ 2 – 97 – 95 – …..-1

    = 100 + ( 98-97)+ ( 96-95) +….+ ( 2-1)

    = 100 + 1+1+…+1

    = 100 +( 1.49 )

    = 100 +49

    = 149

    b, 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + 9 + 10 – 11 – 12 + ….. – 299 – 330 + 301 + 302

    = ( 1+2 -3) + ( -4+5+6-7) + ( -8+9+10-11) +….+(- 299 – 330 + 301) + 302

    = 0+ 302 = 302

    c, (98. 7676 – 9898. 76 ) . (2001.2002.2003. … 2017)

    = (98.101.76-98.101.76 ) . (2001.2002.2003. … 2017)

    = 0. (2001.2002.2003. … 2017)

    = 0

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