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

Toán Lớp 5: tính nhanh 7,15 : 0,5 + 7,15 x 9 – 7,15 : 0,1

Toán Lớp 5: tính nhanh
7,15 : 0,5 + 7,15 x 9 – 7,15 : 0,1

Comments ( 2 )

  1. 7,15 : 0,5 + 7,15 xx 9 – 7,15 : 0,1
    = 7,15 xx 2 + 7,15 xx 9 – 7,15 xx 10
    = 7,15 xx (2+9 – 10)
    = 7,15 xx 1
    = 7,15

  2. 7,15 : 0,5 + 7,15 xx 9 – 7.15 : 0,1
    = 7,15 xx 2 + 7,15 xx 9 – 7,15 xx 10
    = 7,15 xx ( 2 + 9 – 10)
    = 7,15 xx 1
    = 7,15

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

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