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

Toán Lớp 8: Tính a, 2-4+6-8+10-12+14-16 b,5-7+9-11+13-15 c,-2+5-8+11-14+17-20

Toán Lớp 8: Tính
a, 2-4+6-8+10-12+14-16
b,5-7+9-11+13-15
c,-2+5-8+11-14+17-20

Comments ( 2 )

  1. $#Diamond$
    Giải đáp:
    a, -8
    b, -6
    c, -11
    Giải thích:
    a, 2-4+6-8+10-12+14-16
    = (2-4)+(6-8)+(10-12)+(14-16)
    = (-2)+(-2)+(-2)+(-2)
    = (-2) × 4
    = -8
    b, 5-7+9-11+13-15
    = (5-7)+(9-11)+(13-15)
    = (-2)+(-2)+(-2)
    = (-2) × 3
    = -6
    c, -2+5-8+11-14+17-20
    = (-2)+(5-8)+(11-14)+(17-20)
    = (-2)+(-3)+(-3)+(-3)
    = (-2) + (-3) × 3
    = (-2) + (-9)
    = -11

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

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