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b. ( 3/5 + 4/7 ) × ( 7/8 - 1/2 ) = ( 21/35 + 20/35 ) × ( 7/8 -4/8 ) = 41/35 × 3/8 = 123/280
c. 2/3 × 5/6 ÷ 1/4 = (2/3 × 5/6 ) ÷ 1/4 = 10/18 ÷ 1/4 = 10/18 × 4/1 = 40/18 = 2 4/18
d. 7/5 × 11/4 ÷ 5/3 = (7/5 × 11/4 ) ÷ 5/3 = 77/20 ÷ 5/3 = 77/20 × 3/5 = 231/100 = 2 31/100