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a=2b
2*2b+2b=156
4b+2b=156
6b=156
b=26
a=2*26
a=52 m
P=ab
P=26*52
P=1352 m²
2a+2b=156
a=2b
2*2b+2b=156
4b+2b=156
6b=156 /:6
b=26
a=2*26=52
P=a*b
P=52*26=1352cm²
2*52+2*26=156
104+52=156
156=156