设长为xcm则
(50x+78x+50*78)*2=108040
x=391.5625
体积=391.5625*50*78=1527093.75cm³
棱长=2*(50+78+391.5625)=1039.125cm
50*78=3900 3900*2=7800 108040-7800=100240
设长x 2*50*x+2*78*x=100240 100x+156x=100240 256x=100240 x=391.5625
长391.5625cm
设长为a 50a X 2 + 78a X 2 + 50 X 78 X2 =108040 a=391.5625
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