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

Toán Lớp 5: Tính nhanh: 2021×2+20,21×30+2,021×500

Toán Lớp 5: Tính nhanh:
2021×2+20,21×30+2,021×500

Comments ( 2 )

  1.    2021×2+20,21x 30+2,021x 500
    = 2,021x 1000x 2+2,021x 10x 30+2,021x 500
    = 2,021x 2000+ 2,021x 300+ 2,021x 500
    = 2,021x ( 2000+ 300+ 500)
    = 2,021x 2800
    = 5658,8
     

  2. @Pảk
    2021×2+2021×0,3+2021×0,5
    = 2021x(2+0,3+0,5)
    =2021×2,8
    =5658,8
    BTS
     

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