Răspuns :
prima problema:
a+b=157
a:b=5 r 13=>a=b×5+13
5b+13+b=157
6b=157-13
6b= 144
b=144:6
b=24
a+24=157
a=157-24
a= 133
a+b=157
a:b=5 r 13=>a=b×5+13
5b+13+b=157
6b=157-13
6b= 144
b=144:6
b=24
a+24=157
a=157-24
a= 133