Răspuns :
a+b = 53
a-b= 13
53-13 = 40 ( 2 parti egale )
40:2 = 20 ( b )
53-20= 33 ( a ) sau 20+13 = 33 ( a )
a-b= 13
53-13 = 40 ( 2 parti egale )
40:2 = 20 ( b )
53-20= 33 ( a ) sau 20+13 = 33 ( a )