а=4
2•4-4•2=0
а=-3
2•(-3)-(-3)•2=-6+6=0
а=0
2•0-0•2=0
а=2
2•2-2•2=0
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а=4
2•4-4•2=0
а=-3
2•(-3)-(-3)•2=-6+6=0
а=0
2•0-0•2=0
а=2
2•2-2•2=0