N 8:
6+1=7
6-1=5
12+1=13
12-1=11
8-8=0
15-15=0
9-0=9
0+7=7
N 9:
6x3=18
20:5=4
14:7=2
3x4=12
16:8=2
2x9=18
N 10:
11-2
2+7
6+3
9-0
Х=51 , 52, 53, 54, 55, 56, 57, 58, 59
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235,253,352,325,532,523.
1)523+532=1055
2)235+253=488