Răspuns:
Explicație pas cu pas:
18,23-5,23-1,(2)=1823/100-523/100-(12-1)/9=1300/100-11/9=13-(11/9)=
(13·9-11)/9=(117-11)/9=106/9
140-13,(8)-87,75=140-(138-13)/9-8775/100=140-125/9-8775/100=
140-125/9-351/4=(140·36-125·4-351·9)/36= (5040-500-3159)/36=1381/36
1,(7)+2,(7)+3,(7)=16/9+25/9+34/9=(16+25+34)/9=75/9=25/3
