Răspuns :
a)90 grade-50 grade=40 grade
b)90 grade-23 grade12'=66 grade48'
c)90 grade-58 grade58'58"=31 grade41'42"
b)90 grade-23 grade12'=66 grade48'
c)90 grade-58 grade58'58"=31 grade41'42"