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

Toán Lớp 4: Bài 4: Tính nhanh: 8 x 427 x 3 + 6 x 573 x 4 6 x 1235 x 20 – 5 x 235 x 24 (145 x 99 + 145 ) – ( 143 x 102 – 143 ) 54 x 47 – 47 x 53 – 2

Toán Lớp 4: Bài 4: Tính nhanh:
8 x 427 x 3 + 6 x 573 x 4 6 x 1235 x 20 – 5 x 235 x 24
(145 x 99 + 145 ) – ( 143 x 102 – 143 ) 54 x 47 – 47 x 53 – 20 – 27

Comments ( 2 )

  1. # tcv
    Bài 4 :
    (145 x 99 + 145 ) – ( 143 x 102 – 143 × 2 ) + 54 x 47 – 47 x 53 – 20 – 27
    = (145×99+145×1)-(143×102-143×2)+54 x 47 – 47 x 53-(20+27)
    = (145×99+145×1)-(143×102-143×2)+54 x 47 – 47 x 53-47×1
    = 145 × 100 – 143 × 100 + 47x(54-53-1)
    = 100x(145-143)+47×0
    = 200
    ————
    = 3381×3+6x573x4
    = 10143+13728
    = 2387

  2. (145 x 99 + 145 ) – ( 143 x 102 – 143 × 2 ) + 54 x 47 – 47 x 53 – 20 – 27
    = 145 × (99 + 1) – 143 × (102 – 2) + 47 × (54 – 53) – (20 + 27)
    = 145 × 100 – 143 × 100 + 47 × 1 – 47
    = 100 × (145 – 143) + (47 – 47)
    = 100 × 2 + 0
    = 200
    a)
    =3381×3+6x573x4
    =10143+13728
    =23871

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

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