2.
\((1)\)
分式\(\dfrac{5}{4{{x}^{2}}y{{z}^{3}}}\)和\(\dfrac{7}{6{{x}^{5}}{{y}^{2}}}\)的最简公分母是_________.
\((2)\) 等腰三角形中有两条边长分别是\(3\)和\(7\),则这个三角形的周长是_________.
\((3)\) 对于分式\( \dfrac {x^{2}-9}{x+3}\),当\(x \)______ 时,分式无意义;当\(x \)______ 时,分式的值为\(0\).
\((4)\) 已知:在
\(□\)\(ABCD\)中,对角线\(AC\)、\(BD\)相交于点\(O\),过点\(O\)的直线\(EF\)分别交\(AD\)于\(E\)、\(BC\)于\(F\),\(S_{\triangle AOE}=3\),\(S_{\triangle BOF}=5\),则
\(□\)\(ABCD\)的面积是_________.
\((5)\) 如图,将\(\triangle ABC\)绕点\(C\)按顺时针方向旋转至\(\triangle A′B′C\),使点\(A′\)落在\(BC\)的延长线上\(.\)已知\(∠A=27^{\circ}\),\(∠B=40^{\circ}\),则\(∠ACB′= \)______度.
\((6)\) 如图,已知正方形\(ABCD\)的边长为\(3\),\(E\)、\(F\)分别是\(AB\)、\(BC\)边上的点,且\(∠EDF=45^{\circ}\),将\(\triangle DAE\)绕点\(D\)逆时针旋转\(90^{\circ}\),得到\(\triangle DCM.\)若\(AE=1\),则\(FM\)的长为______.