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a) 2a * b *√7c²=2√7abc²
b) -2a²b² * a²c² *( -7b² c²)=14a⁴b⁴c⁴
c) -k * k² *( -k ⁴)=k⁷
d) - ½ n * ½ mn * ½ m² n² =-1/8n⁴m³