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\(\cfrac{2}{5} x^2-\cfrac{2}{3} x+1=0\) āϏāĻŽā§āĻāϰāύāĻāĻŋāĻā§ \(ax^2+
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\(a=\cfrac{2}{5}, b=-\cfrac{2}{3}\) āĻāĻŦāĻ \(c=1\)
â´ āύāĻŋāϰā§āĻĒāĻ \(=b^2-4ac=\left(-\cfrac{2}{3}\right)^2-4Ã\cfrac{2}{5}Ã1\) \(=\cfrac{4}{9}-\cfrac{8}{5}=\cfrac{20-72}{45} \) \(=-\cfrac{52}{45}<0\)
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