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a²+b²=c²
3²+4²=5²
9+16=25
25=25
x2+ (x+1) 2=( x+2)2
x2+x2+2x+1=x2+4x+3
x2-2x-2=0
trójkąt =12
x=2+2√3/2=1+√3
x=2-2√3/2= 1-√3