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

Toán Lớp 5: Bài 4. Tính nhanh: a) 77 27 + 9 24 + 15 27 b) 72 + 36 x 2 + 24 x 3 + 18 x 4 + 12 x 6 + 168 c) ( 100 + 42) x 42 + (

Toán Lớp 5: Bài 4. Tính nhanh:
a) 77 27 + 9 24 + 15 27 b) 72 + 36 x 2 + 24 x 3 + 18 x 4 + 12 x 6 + 168
c) ( 100 + 42) x 42 + (200 – 58) x 58 d) (100 + 67) x 67 + ( 200 – 33) x 33

Comments ( 2 )

  1. a)(100+67)×67+(200−33)×33
       =167×67+167×33
       =167×(67+33)
       =167×100
       =16700
    b)45,651×73+45,651×20+45,651×7
        =45,651×(73+20+7)
        =45,651×100
        =4565,1
    c)14,2×30+14,2×57+14,2×13
        =14,2×(30+57+13)
        =14,2×100
        =1420
    d)72+36×2+24×3+18×4+12×6+168
       =72×1+72×1+72×1+72×1+72×1+168
       =72×(1+1+1+1+1)+168
       =72×5+168
       =360+168
                

     

  2. Giải đáp:
    a)(100+67)×67+(200−33)×33
       =167×67+167×33
       =167×(67+33)
       =167×100
       =16700
    b)45,651×73+45,651×20+45,651×7
        =45,651×(73+20+7)
        =45,651×100
        =4565,1
    c)14,2×30+14,2×57+14,2×13
        =14,2×(30+57+13)
        =14,2×100
        =1420
    d)72+36×2+24×3+18×4+12×6+168
       =72×1+72×1+72×1+72×1+72×1+168
       =72×(1+1+1+1+1)+168
       =72×5+168
       =360+168
     

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