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3dm*5dm=15dm2
2.100cm*70cm=7000cm2
10dm*7dm=70dm2
P= 3dm x 5 dm = 15 dm²
15dm²=1500cm²
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1m = 10dm
P= 10 dm x 7 dm = 70 dm²
70 dm²= 7000cm²
b=5 dm = 50cm
p= a*b
p= 50*30=1500 cm2
a=30cm=3 dm
p=5*3=15dm2
a=1m=10dm
b=7dm
p=a*b
p=10*7=700dm2