Răspuns:
2,5*{1,3-[11,(2)-(3,(2)+1,5-0,2(3))*2,5]*5,2(4)}=
25/10×{13/10-[ (112-11)/9-((32-3)/9+15/10-(23-2)/90) ×25/10]× [(524-52)/90]} =
5/2×{13/10-[101/9 - (29/9+3/2-21/90) ×25/10]×472/90}=
5/2×{13/10-[101/9 - (29/9+3/2-7/30)×5/2]×236/45}=
Aducem paranteza rotunda la numitor comun 90:
5/2×{13/10-[101/9 - (290/90+135/90-21/90)×5/2]×236/45=
5/2×{13/10-[101/9-404/90×5/2]×236/45}=
5/2×[13/10-(101/9-202/45×5/2)×236/45]=
5/2×[13/10-(101/9-101/9)×236/45]=
5/2×(13/10-0×236/45)=
5/2×13/10=
65/20=
13/4
Explicație pas cu pas: