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

Toán Lớp 4: Bài 2 : Tính bằng cách thuận tiện nhất : a) 13 × 5 × 2 5 × 2 × 34 b) 2 × 26 × 5

Toán Lớp 4: Bài 2 : Tính bằng cách thuận tiện nhất :
a) 13 × 5 × 2 5 × 2 × 34
b) 2 × 26 × 5 5 × 9 × 3 × 2

Comments ( 2 )

  1. $\text{a) 13 × 5 × 2}$
    $\text{= 13 × (5 × 2)}$
    $\text{= 13 × 10}$
    $\text{= 130}$
    $\text{5 × 2 × 34}$
    $\text{= 10 × 34}$
    $\text{= 340}$
    $\text{b) 2 × 26 × 5}$
    $\text{= 26 × (2 × 5)}$
    $\text{= 26 × 10}$
    $\text{= 260}$
    $\text{5 × 9 × 3 × 2}$
    $\text{= (5 × 2) × (9 × 3)}$
    $\text{= 10 × 27}$
    $\text{= 270}$
     
     
     
     

  2. a) 13 × 5 × 2 = 13 × (5 × 2 )=13×10=130
    5×2×34=(5×2)×34=10×34=340
    b)2 × 26 × 5 =(2 × 5 ) × 26 =10 × 26=260
    5 × 9 × 3 × 2=(5 × 2)×( 9 × 3 )=10×27=270

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

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