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

Toán Lớp 6: d) (-1) + (-2) + 3 + 4 + -.. + (-97) + (-98) + 99 + 100 e) 24 + (-182) + 176 + (-18) + 400 g) (-2020) + 200 + (-80) + 1900 giai giu

Toán Lớp 6: d) (-1) + (-2) + 3 + 4 + …… + (-97) + (-98) + 99 + 100
e) 24 + (-182) + 176 + (-18) + 400
g) (-2020) + 200 + (-80) + 1900
giai giup minh voi

Comments ( 2 )

  1. d) (-1) + (-2) + 3 + 4 + …… + (-97) + (-98) + 99 + 100
    =  ( − 1 ) + 3 ] + [ ( − 2 ) + 4 ] + … + [ ( − 97 ) + 99 ] + [ ( − 98 ) + 100 ]
    = 2 + 2 + … + 2 + 2 ( 50 số 2 )
    = 2 x 50
    = 100
    e) 24 + (-182) + 176 + (-18) + 400
    = ( 182 + 18 ) + ( 176 + 24 ) + 400
    = 200 + 200 + 400
    = 800
    g) (-2020) + 200 + (-80) + 1900
    = ( 2020 + 80 ) + 200 + 1900
    = 2100 + 2100
    =  4200
     

  2. d) (-1) + (-2) + 3 + 4 + … + (-97) + (-98) + 99 + 100
    = [(-1) + 3] + [(-2) + 4] + … + [(-97) + 99] + [(-98) + 100]
    = 2 + 2 + … + 2 + 2  ( 50 số 2 )
    = 2 . 50 = 100
    e) 24 + (-182) + 176 + (-18) + 400
    = (24 + 176 + 400) + [(-182) + (-18)]
    = 600 + (-200) = 400
    g) (-2020) + 200 + (-80) + 1900
    = [(-2020) + (-80)] + (200 + 1900)
    = (-2100) + 2100 = 0

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

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