5,6*5,5^2 - 5,6*4,5^2 5,6*(5,5^2 -4,5^2) 2*(5,5-4,5)*(5,5+4,5) 2*1*10
------------------------------ = --------------------------- = ------------------------------ = ----------- = 2/4,4 = 5/11
2,8*7,2^2 - 2,8*2,8^2 2,8*(7,2^2 - 2,8^2) (7,2 -2,8)*(7,2+2,8) 4,4*10