Răspuns:
Explicație pas cu pas:
a)=11/3-7/15=(11x5-7)/15=48/15=16/6
b)9/4-5/18=(9x9-5x2)/36=(81-10)/36=71/36
c)1-18/99=(99-18)/99=81/99=9/11
d)11/15+5/2=(11x2+5x15)/30=(22+45)/30=67/30
e)7/3-7/5=7(5-3)/15=14/15
f)1,015+0,05=1,065
