共50条信息
\((2)\)因式分解:\(m^{2}{-}4m\).
计算:\(2\cos 60{}^\circ -{{(-3)}^{-3}}+{{(\pi -\sqrt{3})}^{0}}-\left| -2 \right|\).
已知\(x=3+2\sin 60{}^\circ \)求\((x+2-\dfrac{5}{x-2})(\dfrac{{{x}^{2}}-2x+1}{{{x}^{2}}+2x-3}-\dfrac{x}{{{x}^{2}}+3x}\)的值.
计算:\(\dfrac{1}{\sqrt{3}-1}+\tan {{60}^{\circ }}-\sqrt{32}\times \sqrt{\dfrac{1}{8}}\).
如图,在平面直角坐标系中,已知点\(A(1,0)\),\(B(1-a,0)\),\(C(1+a,0)(a > 0)\),点\(P\)在以\(D(4,4)\)为圆心,\(1\)为半径的圆上运动,且始终满足\(∠BPC=90^{\circ}\),当\(a\)取最小值时,\(\tan ∠PBC=\)______.
如图,\(⊙O\)是\(\triangle ABC\)的外接圆,\(⊙O\)的半径\(R=2\),\(\sin \)\(B=\),则弦\(AC\)的长为____________.
进入组卷