Question

me responde as questoes da foto ai, por favor

Answer 1

A) $12 \sqrt{3}+20 \sqrt{3} -15 \sqrt{3} = 12+20-15\sqrt{3}=17 \sqrt{3}$

B) $3 \sqrt{7}-4 \sqrt{7} = 3-4 \sqrt{7}=\sqrt{7}$

C) $20 \sqrt{7} -18 \sqrt{7} +5 \sqrt{7} -16 \sqrt{7} = -9 \sqrt{7}$

D) $9 \sqrt{5} + 7 \sqrt{2}-2 \sqrt{5}+7 \sqrt{2} = 7 \sqrt{5} + 14 \sqrt{2}$

E) $12 \sqrt{11}-3 \sqrt{5}-2 \sqrt{5}+8 \sqrt{11} = 20 \sqrt{11} - 5 \sqrt{5}$

Espero ter ajudado. :))