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

Toán Lớp 7: 15x12x7 ————= 24×25 Giúp mình với

Toán Lớp 7: 15x12x7
————=
24×25
Giúp mình với

Comments ( 2 )

  1. Answer
    {15 xx 12 xx 7}/{24 xx 25}
    = {3 xx 5 xx 4 xx 3 xx 7}/{4 xx 3 xx 2 xx 5 xx 5}
    = {1 xx 1 xx 1 xx 3 xx 7}/{1 xx 1 xx 2 xx 5}
    = {3 xx 7}/{2 xx 5}
    = 21/10

  2. (15 × 12 × 7)/(24 × 25 ) = (5 × 3 × 12 × 7)/(12 × 2 × 5 × 5) = (3 × 7)/(2 × 5) = 21/10
     

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

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