Răspuns :
a). 261+(342+175)=
261+517=778
b). 386+(290+143)=
386+433=819
c). 526+(82+191)=
526+273=799
d). 743+(95+130)=
743+225=968
a) 342+175=517
517+261=778
b) 290+175=465
465+386=851
c)82+191=273
273+526=799
d)95+130=225
225+743=968
a). 261+(342+175)=
261+517=778
b). 386+(290+143)=
386+433=819
c). 526+(82+191)=
526+273=799
d). 743+(95+130)=
743+225=968
a) 342+175=517
517+261=778
b) 290+175=465
465+386=851
c)82+191=273
273+526=799
d)95+130=225
225+743=968