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2²+b²=3²
4+b²=9 |-4
b²= 5
b= √5
proszę o naj :))
4+x²=9 -4
x² =5
x²=√5
x² + 2²= 3²
x² + 4 = 9
x²= 9-4
x² = 5
x=√5