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225+90=315
315:1/2=630
630:15=42
42-15=27
27-15=12
odcinek b=12
lub inny sposob
Ptrapezu-Pkwadratu= 90
0.5(15+b+15)* 15- (15*15)=90
7,5(30+b)- 225=90
225+7,5b-225=90
7,5b= 90 |:7,5
b= 12