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

Toán Lớp 6: Tính nhanh 37581-9999 7345-1998 485321-99999 7593-1997 997+96

Toán Lớp 6: Tính nhanh
37581-9999
7345-1998
485321-99999
7593-1997
997+96

Comments ( 2 )

  1. 37581-9999=37581-10000+1=27581+1=27582
    7345-1998=7345-2000+2=5345+2=5347
    485321-99999=485321-100000+1=385321
    7593-1997=7593-2000+3=5593+3=5596
    997+96=997+3+93=1000+93=1093

  2. $\text{37581 – 9999 }$
    $\text{= 37582 – 10000}$
    $\text{= 27582}$
    ————————-
    $\text{7345 – 1998}$
    $\text{= 7347 – 2000}$
    $\text{= 5347}$
    —————————
    $\text{485321 – 99999}$
    $\text{= 485322 – 100000}$
    $\text{= 385322}$
    ————————–
    $\text{7593 – 1997}$
    $\text{= 7596 -2000}$
    $\text{=5596}$
    ————————–
    $\text{997 + 96}$
    $\text{= 993 +100}$
    $\text{= 1093}$
     

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

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