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2m2 *5%=0,01 m2
2 m2 -0,01 m2= 1.99 m2
pole szyby to 1.99 m2
80 * 250 = 20000
20000 * 5/100 = 1000 5% =5/100
20000 - 1000 = 19000
Szyba ma powierzchnie 19000 cm kw.
2*0,05=0,1
2-0,1=1,9m²