Răspuns :
3 segmente + 15 = 60 /-15
3 segmente = 45 /÷3
1 segment = 15
60 = 3 segm. + 15
45 = 3 segm
1 segm = 45 : 3
1 segm = 15
Deci b = 15
Iar a = 15 * 4 + 15
a = 60 + 15
a = 75
3 segmente + 15 = 60 /-15
3 segmente = 45 /÷3
1 segment = 15
60 = 3 segm. + 15
45 = 3 segm
1 segm = 45 : 3
1 segm = 15
Deci b = 15
Iar a = 15 * 4 + 15
a = 60 + 15
a = 75