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

Toán Lớp 6: tính a, ( -2 ) + (-1) b, (-3)+(-2)+(-1)+(0)+(1)+(2)

Toán Lớp 6: tính
a, ( -2 ) + (-1)
b, (-3)+(-2)+(-1)+(0)+(1)+(2)

Comments ( 2 )

  1. a,(-2)+(-1)=-(2+1)
                     =-3
    b,(-3)+(-2)+(-1)+(0)+(1)+(2)
    =[(-2)+(2)]+[(-1)+(1)]+(-3)+(0)
    =0+0+(-3)+0
    =-3

  2. a, (-2) + (-1)
    = -(2 + 1)
    = -3
    b, (-3) + (-2) + (-1) + 0 + 1 + 2
    = (-2 + 2) + (-1 + 1) + (-3 + 0)
    = 0 + 0 + (-3)
    = -3
     

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

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