1] 108 × 3 ÷ 9 – 12 + 42

= 324 ÷ 9 – 12 + 42

= 36 – 12 + 42

= 36 – 54

= –18

2] 94 + 2² – (18 + 3)

= 94 + 2² – 21

= 94 + 4 – 21

= 98 – 21

= 77

3] 50 + (3² – 5) × 2 – 5

= 50 + (9 – 5) × 2 – 5

= 50 + 4 × 2 – 5

= 50 + 8 – 5

= 58 – 5

= 53

4] 215 – (5³ + 3² – 2²) + 12

= 215 – (125 + 9 – 4) + 12

= 215 – 130 + 12

= 97

5] (10³ – 10²) × 5 ÷ 25

= (1000 – 100) × 5 ÷ 25

= 900 × 5 ÷ 25

= 4500 ÷ 25

= 180

Answer:

1)66

2.77

3.53

4.97

5.180

Step-by-step explanation:

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