22. a) [tex](6 \sqrt{288}-3 \sqrt{648}):(2 \sqrt{81})=(72 \sqrt{2}-54 \sqrt{2}):(2*9)=18 \sqrt{2}:18=[/tex][tex]1 \sqrt{2}= \sqrt{2} [/tex]
b) [tex]( \sqrt{735}- \sqrt{540}): \sqrt{5}-( \sqrt{1344}- \sqrt{525}): \sqrt{7}= [/tex][tex](7 \sqrt{15}-6 \sqrt{15}): \sqrt{5}-( 8\sqrt{21}- 5\sqrt{21}): \sqrt{7}= [/tex][tex] \sqrt{15}: \sqrt{5}-3 \sqrt{21}: \sqrt{7}= \sqrt{3}-3 \sqrt{3}=1 \sqrt{3}-3 \sqrt{3}=(1-3) \sqrt{3}=-2 \sqrt{3} [/tex]
