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2014-03-31T17:53:36+03:00
P=2*l+2*L=2l+6l=8l=128 l=16 L=48 A=16*48=768
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2014-03-31T17:54:06+03:00
128=2L+2l
L=3l
128=8l/8
l=16cm
L=3*16=48cm
A=L*l=16*48=768
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