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2²+3²=4²
4+9=16
13=16
B- √2, √3, √5
√2+²√3²=√5²
2+3=5
5=5
C- √3, 2, √5
√3²+2²=√5²
3+4=5
7=5
D- 4,5,2√5
4²+(2√5)²=5²
16+20=25
36=25
trójkąt B jest prostokątny