(49b/a-4a/b) * 1/7b+2a решите

Question

(49b/a-4a/b) * 1/7b+2a решите

Answer 1

(49b/a-4a/b)*1/7b+2a= 49b^2-4a^2/ab*7b+2a=(7b-2a)(7b+2a)*1/ab*(7b+2a)=7b-2a/ab