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c^=(x√2 )^ + (x√5)^
c^=2x^ +5x^
c^=7x^
c=√7x^
c=x √7
--------------------------
( ^------------------->oznacza do kwadratu)
b=pierwiastek z 5cm
c=?
c^=a^+b^
c^=(pierwiastek z 2cm)^ + (pierwiastek z 5cm)^ (potęga likwiduje pierwiastek)
c^=2cm^ + 5cm^
c^=7cm^
c=pierwiastek z 7cm^=pierwiastek z 7 cm