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

Toán Lớp 5: Tính nhanh : 0,9 x 86 + 0,9 x 22 + 1,8 – 9

Toán Lớp 5: Tính nhanh : 0,9 x 86 + 0,9 x 22 + 1,8 – 9

Comments ( 2 )

  1. 0,9 x 86 + 0,9 x 22 + 1,8 – 9
    = 0,9 x ( 86 + 22 ) + 1,8 – 9
    = 97,2 + 1,8 – 9
    = 90

  2. 0,9xx86+0,9xx22+1,8-9
    = 0,9xx86+0,9xx22+0,9xx2-10xx0,9
    = 0,9xx(86+22+2-10)
    = 0,9xx100
    = 90
     

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

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