Add pair of rational numbers, given below, and show that their additions (sum) is also a rational number 7 15 and 3

Question

Add pair of rational numbers, given below, and show that their additions (sum) is also a rational
number 7
15
and 3
5
.

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Adeline 2 weeks 2021-09-04T17:01:53+00:00 1 Answer 0 views 0

Answers ( )

    0
    2021-09-04T17:03:20+00:00

    Step-by-step explanation:

    (i) -5/8 and 3/8

    = -5/8 + 3/8 (∵ Denominators are same, ∴ LCM = 8)

    = (-5 + 3)/8

    = -2/8 = -1/4

    Which is a rational number.

    (ii) -8/13 and -4/13

    = -8/13 + (-4/13) (∵LCM of 13 and 13 = 13)

    = (-8 -4)/13 = -12/13

    Which is a rational number.

    (iii) 6/11 and -9/11

    = 6/11 + (-9/11) (∵ Denominators are same, ∴ LCM = 11)

    = (6 – 9)/11 = -3/11

    Which is a rational number.

    (iv) 5/-26 and 8/39

    = 5/-26 + 8/39

    = (-5 × 3)/26 × 3 + (8 × 2)/39 × 2

    ∵ LCM of 26 and 39 = 2 × 3 × 13 = 78

    = (-15 + 16)/78

    (∵ LCM of 26 and 39 = 78)

    = 1/78

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18:9+8+9*3-7:3-1*13 = ? ( )