1.
计算:
\((1){{(x-y)}^{2}}-(x-2y)(x+y)\);
\((2)(6{{x}^{4}}-8{{x}^{3}})\div (-2{{x}^{2}})\)
\((3)\left| -2 \right|+{{(\dfrac{1}{3})}^{-1}}\times {{(\pi -2018)}^{0}}-\sqrt{9}+\sqrt{{{(-1)}^{4}}}\)
因式分解:
\((4)6x{{y}^{2}}-9{{x}^{2}}y-{{y}^{3}}\)
解方程:
\((5)\dfrac{2}{3x-1}-1=\dfrac{3}{6x-2}\)
\((6)\dfrac{4}{{{y}^{2}}-1}+\dfrac{y+2}{1-y}=-1\)