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

Toán Lớp 5: Tính Bằng cách thuận tiện 7,2*2,7+7,3*7,2 54,57*123-54,57*23

Toán Lớp 5: Tính Bằng cách thuận tiện
7,2*2,7+7,3*7,2
54,57*123-54,57*23

Comments ( 2 )

  1. $\text{a) 7,2 × 2,7 + 7,3 × 7,2}$
    $\text{= 7,2 × (2,7 + 7,3)}$
    $\text{= 7,2 × 10}$
    $\text{= 72}$
    $\text{b) 54,57 × 123 – 54,57 × 23}$
    $\text{= 54,57 × (123 – 23)}$
    $\text{= 54,57 × 100}$
    $\text{= 5457}$
    $\textit{Ha1zzz}$
     

  2. Giải đáp:
    7,2*2,7+7,3*7,2=7,2*(2,7+7,3)=7,2*10=72
    54,57*123-54,57*23=54,57(123-23)=54,57*100=5457
     

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