ajutatima va rog dau corona si stele

Răspuns:
a. (5×9+4)/9+(6×12+5)/12=
⁴⁾49/9+³⁾77/12=
196/36+231/36=
427/36
b. ³⁾-3/14+²⁾2/21=
-9/42+4/42=
-5/42
c. (-5×11+5)/11× (2×5+1)/5=
-60/11·11/5=
-12
d.8/15:(5×3+1)/3=
8/15:16/3=
8/15×3/16=
1/10