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b)l=6cm,L=9cm c)l=5mm,L=10mm

Răspuns :

b) P = 2 ( L+l) ____ P = 2 (9+6) ____ P = 2 • 15 _____ P= 30 cm _____ P = 2 * L + 2 * l _____ P = 2 * 9 + 2*6_____ P= 18 +12_____ P=30 cm ______ c) P = 2 (L+l)______ P= 2 (10+5)______ P = 2 * 15______ P = 30 mm______ P= 2•L + 2•l______ P = 2•10+2•5______ P= 20+10______ P=30 mm____ Sunt pe telefon .
6×2+9×2=12+18=30; 5×2+10×2=10+20=30 marchezi ca cel mai bun?