✨ Best Answer ✨
9x=9x^2-1
9x^2-9x-1=0
x={9±√(81-4・9・(-1))}/2・9
={9±√117}/18
={9±3√13}/18
={3±√13}/6
です。
✨ Best Answer ✨
9x=9x^2-1
9x^2-9x-1=0
x={9±√(81-4・9・(-1))}/2・9
={9±√117}/18
={9±3√13}/18
={3±√13}/6
です。
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