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Ob 1. ab+ab+a+b+a+b = 2ab + 2a+2b
Ob. 2 b-2+b-2+a+3+a+3= 2a+2b+2
Ob. 3 3b-5+3b-5+2a-b+2+2a-b+2= 4b-6 + 4a
2*(a+b)+2*(ab)=2a+2b+2ab
2*(a+3)+2*(b-2)=2a+6+2b-4=2a+2b+2
2*(2a-b+2)+2*(3b-5)=4a-2b+4+6b-10=4a+4b-6
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Ob 1. ab+ab+a+b+a+b = 2ab + 2a+2b
Ob. 2 b-2+b-2+a+3+a+3= 2a+2b+2
Ob. 3 3b-5+3b-5+2a-b+2+2a-b+2= 4b-6 + 4a
2*(a+b)+2*(ab)=2a+2b+2ab
2*(a+3)+2*(b-2)=2a+6+2b-4=2a+2b+2
2*(2a-b+2)+2*(3b-5)=4a-2b+4+6b-10=4a+4b-6