Răspuns:
a) 53/15
b) 77/30
c) 0
d) 31/25
Explicație pas cu pas:
a) (23-2)/9 + 12/10 = 7/3+6/5 = (7*5 + 3*6)3*5= (35+18)/15=53/15
b) 3/90+(253-25)/90=1/30+228/90=1/30 + 76/30 = 77/30
c) (2129-212)/900 - 213/100=1917/900 - 213/100 = (213-213)/100=0
d) (327+73)/100 * 31/100 = 4 * 31/100 = 31/25