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b. 11/7 + 1/6 * (3/2- 1/2)
= 11/7 * 1/6 * (1)
= 11(6) + 1(7) / 7*6
= 73/42
c. 3/4 + (2/3 + 1/6)
=3/4 + 2(2) + 1 / 6
= 3/4 + 5/6
= 3(3) + 5(2) / 12
= 19/12
d. 1/7 + (5/6) (7/2 - 1/4)
= 1/7 + 5/6 * 7(2) - 1 / 4
= 1/7 + 5/6 * 13/4
= 1/7 + 65/24
= 479/168