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a)P=(7 cm*10 cm):2=35 cm²
b)7 dm=70 cm
P=(3,6 cm*70 cm):2=126 cm²
c)(2/3 cm*8 cm):2=(16/3):2=16/3*1/2=8/3 cm²=2 2/3 cm²
Zad.2
b)6 dm=60 cm
P=[(3,7 cm+8,3 cm)*60 cm]:2=360 cm²