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

Toán Lớp 5: Tính bằng cách thuận tiện. a) 13,35 × 4 × 0,25 b) 6,47 × 0,5 × 0,2 c) 0,125 × 5,21 × 8 d) 4,37 × 1,25 × 80 Giúp em với hứa vote 5 sao

Toán Lớp 5: Tính bằng cách thuận tiện.
a) 13,35 × 4 × 0,25
b) 6,47 × 0,5 × 0,2
c) 0,125 × 5,21 × 8
d) 4,37 × 1,25 × 80
Giúp em với hứa vote 5 sao

Comments ( 2 )

  1. a)12,35xx4xx0,25
    =12,35xx1
    =12,35
    b)6,47xx0,5xx0,2
    =6,47xx0,1
    =0,647
    c)0,125xx5,21xx8
    =(0,125xx8)xx5,21
     =1xx5,21
    =5,21
    d)4,37xx1,25xx80
    =4,37xx100
    =437

  2. $\text{a) 13,35 x 4 x 0,25}$
    $\text{= 13,35 x (4 x 0,25)}$
    $\text{= 13,35 x 1}$
    $\text{= 13,35}$
    $\text{b) 6,47 x 0,5 x 0,2}$
    $\text{= 6,47 x (0,5 x 0,2)}$
    $\text{= 6,47 x 0,1}$
    $\text{= 0,647}$
    $\text{c) 0,125 x 5,21 x 8}$
    $\text{= (0,125 x 8) x 5,21}$
    $\text{= 1 x 5,21}$
    $\text{= 5,21}$
    $\text{d) 4,37 x 1,25 x 80}$
    $\text{= 4,37 x (1,25 x 80)}$
    $\text{= 4,37 x 100}$
    $\text{= 437}$

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