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

Toán Lớp 6: tính nhanh:11-12+13-14+15-16+17-18+18-19+19-20

Toán Lớp 6: tính nhanh:11-12+13-14+15-16+17-18+18-19+19-20

Comments ( 2 )

  1.  11-12+13-14+15-16+17-18+18-19+19-20
    = (11-12) + (13-14) + (15-16) + (18-19) + (19-20)
    = (-1) + (-1) + (-1) + (-1) + (-1) + (-1) 
    = -6  
    Gửi tus ạ 

  2. Giải đáp:
     $11-12+13-14+15-16+17-18+18-19+19-20$
    $= (11+19)+[(-12)+(-18)]+(13+17)+[(-14)+(-16)]+(15+18-19-20)$
    $= 30+(-30)+30+(-30)+(-6)$
    $ = 0+(-6)$
    $=-6$
     

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