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b) √7a¹⁰b⁹ = a⁵b⁴√7b
c) -12√2⁷a⁷ = -2² · 3 · 2³a³√2a = -2⁵ · 3a³√2a = -32 · 3a³√2a = -96a³√2a
d) 16/5√25/5 = 2⁴/2√5²/2 = 2⁴·5/5√1/2 = 80/5√1/2 = 16√1/2