1-4
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, .
+4=12 4+=12
=12-4 =12-4
=8 =8 ____
8+4=12 4+8=12
12=12 12=12
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, .
-7=3
=3+7
=10
10-7=3
3=3
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, .
8- =5
=8-5
=3
8-3=5
5=5
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3=6 4=8
=6:3 =8:4
=2 =2
23=6 42=8
6=6 8=8
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:5=3
=35
=15
15:5=3
3=3
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, . 6:=2
=6:2
=3
6:3=2
2=2
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