Thực hiện phép tính: A/ 7/3 × 81/14 B/ 5/12 + -8/7 × 7/12 C/ 5/7 × 19/23 + 5/7 × 5/23 – 5/7 × 1//3 D/ -3/4 × 7/6 + 5/6 × -3/4

Question

Thực hiện phép tính:
A/ 7/3 × 81/14
B/ 5/12 + -8/7 × 7/12
C/ 5/7 × 19/23 + 5/7 × 5/23 – 5/7 × 1//3
D/ -3/4 × 7/6 + 5/6 × -3/4

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Reagan 2 tháng 2021-10-06T22:17:12+00:00 1 Answers 6 views 0

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    2021-10-06T22:18:12+00:00

    A/ 7/3 × 81/14

    = (7×3^4)/(3x2x7)

    = 3^3/2

    = 27/2

    B/ 5/12 + -8/7 × 7/12

    = 5/12 – 8/12

    = -3/12

    = -1/4

    C/ 5/7 × 19/23 + 5/7 × 5/23 – 5/7 × 1/3

    = 5/7 x (19/23 + 5/23 – 1/3)

    = 5/7 x 1

    = 5/7

    D/ -3/4 × 7/6 + 5/6 × -3/4

    = -3/4 x (7/6 +5/6)

    = -3/4 x 2

    = -3/2

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