1.Tính: a. -5/8+3/7-3/8+4/7 b. 5/16-7/13-3/16+-6/13 c. 3/15-7/-8+-1/3 d. 1/3+1/-5-1/-6+-1/8 e. -5/12- (3/4+7/12-2/8)

Bởi

1.Tính:
a. -5/8+3/7-3/8+4/7
b. 5/16-7/13-3/16+-6/13
c. 3/15-7/-8+-1/3
d. 1/3+1/-5-1/-6+-1/8
e. -5/12- (3/4+7/12-2/8)

0 bình luận về “1.Tính: a. -5/8+3/7-3/8+4/7 b. 5/16-7/13-3/16+-6/13 c. 3/15-7/-8+-1/3 d. 1/3+1/-5-1/-6+-1/8 e. -5/12- (3/4+7/12-2/8)”

  1. a) -5/8 + 3/7 – 3/8 + 4/7

    = (-5/8 – 3/8) + (3/7 + 4/7)

    = -8/8 + 7/7

    = -1 + 1

    = 0

    b) 5/16 – 7/13 – 3/16 + (-6/13)

    = (5/16 – 3/16) + [-7/13 + (-6/13)]

    = 2/16 + (-13/13)

    = 1/8 – 1

    = -7/8

    c) 3/15 – 7/-8 + (-1/3)

    = 43/30 – 1/3

    = 89/120

    d) 1/3 + 1/-5 – 1/-6 + (-1/8)

    = 1/3 – 1/5 + 1/6 – 1/8

    = 2/15 + 1/6 – 1/8

    = 3/10 – 1/8

    = 7/40

    e) -5/12 – (3/4 + 7/12 – 2/8)

    = -5/12 – (4/3 – 2/8)

    = -5/12 – 13/12

    = -3/2

     

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