1)a+1, a+3
2)(a+1+a+3)/2=(2a+4)/2=a+2
3)15 3/5 + 6 2/5=21+3/5+2/5=21+1=22
4)a+2=22, a=22-2, a=20
5)20+1,=21, 20+3=23
6)(21+23)/2=44/2=22
7)Otvet: 23
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Answers & Comments
1)a+1, a+3
2)(a+1+a+3)/2=(2a+4)/2=a+2
3)15 3/5 + 6 2/5=21+3/5+2/5=21+1=22
4)a+2=22, a=22-2, a=20
5)20+1,=21, 20+3=23
6)(21+23)/2=44/2=22
7)Otvet: 23