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2014-04-17T15:00:18+03:00
2400 mm = 240 cm
3 dm = 30 cm
a)P = 2L + 2l = 2 × 240 + 2 × 30 = 480 + 60 = 540 cm
b) P = 4l
    540 = 4l
    l = 540 : 4
    l = 135 cm
6 4 6