Răspuns :
[tex]\it (17:80-0,0325)\cdot100=(0,2125-0,0325)\cdot100=0,18\cdot100=18\\ \\ \rule{120}{0.7}\\ \\ (17:80-0,0325)\cdot100=\Big(\dfrac{^{125)}17}{\ \ 80}-\dfrac{325}{10000}\Big)\cdot100=\dfrac{2125-325}{10000}\cdot100=\\ \\ \\ =\dfrac{1800}{10000}\cdot100=\dfrac{1800\cdot100}{10000}=\dfrac{180000}{10000}=18[/tex]