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• 2 log 50 + 2 log 8 – 2 log 100

= 2 log (50 × 8 ÷ 100)

= 2 log 4

= 2

• log 10 + log 2 – log 4 + log 20

= log (10 × 2 ÷ 4 × 20)

= log (5 × 20)

= log 100

= 2

• 6 log 1 – 2 log 2

= 0 – 1

= – 1