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第１套 (３月 )１．解方程３ｘ -２｜ｘ -２｜＝３ ３ｘ＋１８-２｜３ｘ＋１８ -２｜．２．解不等式ｌｏｇ（２１＋４ｘ－ｘ２）（７－ｘ）ｌｏｇ（ｘ＋３）（２１＋４ｘ－ｘ２）＜ １４．３．在腰长ＣＤ＝３０的梯形ＡＢＣＤ中两对角线相交于点Ｅ ,∠ＡＥＤ＝∠ＢＣＤ．经过点
The first set (March) 1. Solve the equation 3x -2|x -2|=3 3x+18-2|3x+18 -2|. 2. Solution inequality log(21+4x-x2)(7-x)log(x+3)(21+4x-x2)< 14.3. In the trapezoidal ABCD with waist length CD=30, the two diagonal lines intersect at point E, ∠AED=∠BCD. After the point