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y= druga liczba
x:y=3:4
x²+y²=100
x=¾y
(¾y)²+y²=100
⁹/₁₆y²+y²=100
²⁵/₁₆y²=100
y²=100:²⁵/₁₆
y=⁴⁰/₅
y=8
x=¾×8=6
szukane liczby to 6i 8