53² + 22² – 47² - 16² / (65² – 2 • 65 • 59 + 59²)=
=(53²-47²)+(22²-16²) /(65-56)²=
=(53-47)(53+47)+(22-16)(22+16) / 9²=
=(6*100 +6*338 ) / 81=828/81=92/9=10 2/9
