Question

Решите пжжж!!!!!!!!!!

Answer 1

1) =7
$(8 \sqrt{63} - 3 \sqrt{28} - 5 \sqrt{112} ) \div 2 \sqrt{7} = - 2 \sqrt{7} \div 2 \sqrt{7} = 7$
2)
$(15 \sqrt{1.2} + \frac{1}{3} \sqrt{270} - 2 \sqrt{30} = 4 \sqrt{30} - 2 \sqrt{30} = 2 \sqrt{30}$