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

Toán Lớp 6: tính nhanh: 5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42

Toán Lớp 6: tính nhanh:
5 x 7 x 77 – 7 x 60 + 49 x 25 – 15 x 42

Comments ( 1 )

  1. 5 xx 7 xx 77 – 7 xx 60 + 49 xx 25 – 15 xx 42
    = 7 xx ( 77 xx 5 ) – 7 xx 60 +7 x 7 xx 25 – 15 xx  6 xx 7
    = 7 xx 385 – 7 xx 60 + 7 xx 175 – 90 xx 7
    = 7 xx ( 385 – 60 + 175 – 90 )
    = 7 xx 410
    = 2870
     

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

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