a+b=25
a-b=5 a=5+b
5+b+b=25
2b=25-5
b=20;2
b=10
a=5+10=15
a=15
2 ) 28-8=20 20;2=10 oua intrun cosuleti
10+8=18 oua in cealalta cosuleti
3)a+a+1+a+2=24
3a=24-3
a=21;3
a=7
a+1=7+1=8
a+2=7+2=9
4) a+a+2=18
2a=18-2
a=16:2=8 nr mic
a+2=8+2=10 nr mare
10-8=2 diferenta
incincitulnr mic=8*5=40