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

Toán Lớp 6: Bài:Tính nhanh a,35(14-23)-23(14-35) b,66.25+5.66+66.14+33.66

Toán Lớp 6: Bài:Tính nhanh
a,35(14-23)-23(14-35)
b,66.25+5.66+66.14+33.66

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    35(14-23)-23(14-35)
    =35-35+14-14+23-23
    =0
    66.25+5.66+66.14+33.66
    = 66.(25+5+14+33)
    =66.77
    =5082

  2. a, 35 . (14 – 23) – 23 . (14 – 35)
    = 35 . 14 – 35 . 23 – 23 . 14 + 23 . 35
    = (35 . 14 – 23 . 14) + (-35 . 23 + 23 . 35)
    = [14 . (35 – 23)] + 0
    = [14 . 12]
    = 168
    _____________________
    b, 66 . 25 + 5 . 66 + 66 . 14 + 33 . 66
    = 66 . (25 + 5 + 14 + 33)
    = 66 . 77
    = 11 . 6 . 11 . 7
    = (11 . 11) . (6 . 7)
    = 121 . 42
    = 5082

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

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