P=2*(a+b)
1,4+3,4<a+b<2,3+4,5
4,8<a+b<6,8
4,8*2<2(a+b)<2*6,8
9,6<2(a+b)<13,6
9,6<P<13,6
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Verified answer
P=2*(a+b)
1,4+3,4<a+b<2,3+4,5
4,8<a+b<6,8
4,8*2<2(a+b)<2*6,8
9,6<2(a+b)<13,6
9,6<P<13,6