Let's solve each expression step-by-step:

84 - (36 + 24) ÷ 3 × 2

First calculate the parentheses: (36 + 24 = 60)Then divide by 3: (60 ÷ 3 = 20)Now multiply by 2: (20 × 2 = 40)Finally, subtract from 84: (84 - 40 = 44)

Result: 44

187 - (87 - 40 - 17) × 2

First calculate the parentheses: (87 - 40 - 17 = 30)Now multiply by 2: (30 × 2 = 60)Finally, subtract from 187: (187 - 60 = 127)

Result: 127

(85 - 53) - (28 + 16) ÷ 4

First calculate the parentheses in the first part: (85 - 53 = 32)Then calculate the parentheses in the second part: (28 + 16 = 44)Now divide by 4: (44 ÷ 4 = 11)Finally, subtract: (32 - 11 = 21)

Result: 21

271 × 3

Multiply: (271 × 3 = 813)

Result: 813

408 × 2

Multiply: (408 × 2 = 816)

Result: 816

129 × 4

Multiply: (129 × 4 = 516)

Result: 516

28 ÷ 4 × 12

First divide: (28 ÷ 4 = 7)Then multiply: (7 × 12 = 84)

Result: 84

48 ÷ 8 × 13

First divide: (48 ÷ 8 = 6)Then multiply: (6 × 13 = 78)

Result: 78

35 ÷ 5 × 14

First divide: (35 ÷ 5 = 7)Then multiply: (7 × 14 = 98)

Result: 98

Here are the final results:

4412721813816516847898