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x(x-3)/x³=(skracamy przez x) x-3/x²=√2+3-3/(√2+3)²=
√2 / 2-6√2+9= √2 / 7-6√2 = √2(7+6√2) / (7-√2)(7+√2)=7√2+12 / 49-2
=7√2+12 / 47 = 7/47 √2 +12/47
a=7/47 , b= 12/47