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

Toán Lớp 3: Tính nhanh: 13) 64 x 4 + 18 x 4 + 9 x 8 14) 44 x 5 + 18 x 10 + 20 x 5 15) 3 x 4 + 4 x 6 + 9 x 2 + 18

Toán Lớp 3: Tính nhanh:
13) 64 x 4 + 18 x 4 + 9 x 8
14) 44 x 5 + 18 x 10 + 20 x 5
15) 3 x 4 + 4 x 6 + 9 x 2 + 18

Comments ( 2 )

  1. 13.
    64 x 4 + 18 x 4 + 9 x 8
    = 64 x 4 + 18 x 4 + 18 x4
    = 4( 64+18+18)
    = 4 x 100= 400
     14.
    44 x 5 + 18 x 10 + 20 x 5
    = 44 × 5 + 36 × 5 + 20 × 5
    = 5 × (44 + 36 + 20)
    = 5 × 100
    = 500
     15.
    3×4+4×6+9×2+18
    =6×2+12×2+9×2+9×2
    =2×(6+12+9+9)
    =2×36

  2. 13)64×4+18×4+9×8
    =64×4+18×4+18×4
    =4×(64+18+18)
    =4×100
    =400
    14)44×5+18×10+20×5
    =44×5+36×5+20×5
    =5×(44+36+20)
    =5×100
    =500
    15)3×4+4×6+9×2+18
    =6×2+12×2+9×2+9×2
    =2×(6+12+9+9)
    =2×36
    =72

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

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