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

Toán Lớp 6: a, A=(28+46) + [(-34)=(-40)] b, B=(-27)+(-208)+(-43)+(-102) c, C= -287+499+(-499)+285 d D=37-(-43)+(-85)-(-30)+15

Toán Lớp 6: a, A=(28+46) + [(-34)=(-40)]
b, B=(-27)+(-208)+(-43)+(-102)
c, C= -287+499+(-499)+285
d D=37-(-43)+(-85)-(-30)+15

Comments ( 2 )

  1. $#Gửi bạn duys234234 $
    a.
    A =(28+46) + [(-34)+(-40)]
    A = 74 +( -74 )
    A = 0
    b.
    B=(-27)+(-208)+(-43)+(-102)
    B = (-27) + (-43) + (-208) + (-102)
    B = (-70) + (-310)
    B = -380
    c.
    C= -287+499+(-499)+285
    C = ( 499 – 499 ) + ( – 287 + 285 )
    C = 0 – 2
    C = – 2
    d.
    D = 37-(-43)+(-85)-(-30)+15
    D = [ 37-(-43) ] + [ (-85) + 15 ] – ( -30 )
    D = 80 + (-70) – ( -30 ) 
    D = 80 + ( -40 )
    D = 40

  2. b) B=(-27)+(-208)+(-43)+(-102)
          =(-27)+(-43)+(-208)+(-102)
          =(-70)+(-310)
          = -380
    c) C= -287+499+(-499)+285
          =[(-287)+285]+[499+(-499)]
          = (-2)+0
          = -2
    d) D=37-(-43)+(-85)-(-30)+15
           = [37-(-43)]+[(-85)+15]-(-30)
           = 80-70+30
           = 40
     

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

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