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這個很簡單啊!X=8/3
9x²;=100 x²;=100/9 x=-+10/3 你們是不是學了虛數什麼的.= = 貌似還有虛數..
9x²;-5=3 9x^2=8 x^2=8/9 x=±(2根號2)/3
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