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

Toán Lớp 4: Tính 21 × 45/9 × 7 × 3 × 5 ; 32 × 50/48 × 75

Toán Lớp 4: Tính
21 × 45/9 × 7 × 3 × 5 ; 32 × 50/48 × 75

Comments ( 2 )

  1. Giải đáp:
    1)
    21×45/9×7×3×5
    =21×5×7×3×5
    =105×21×5
    =2205×5
    =11025
    2)
    32×50/48×75
    =32×25/24×75
    =(32×75)×25/24
    =2400×25/24
    =(24×100×25)/24
    =100×25
    =2500

  2. @Sad
    21xx45/9xx7xx3xx5
    =(21xx5)xx(7xx3)xx5
    =105xx21xx5
    =2205xx5
    =11025
    ————-
    32xx50/48xx75
    =(75xx32)xx50/48:2
    =2400xx25/24
    =24xx100xx25/24
    =(24xx25xx100)/24
    =25xx100
    =2500
     

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

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