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All of us have already known ____ she will choose is the opportunity to go abroad.
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如图,△ABC的边AB为⊙O的直径,BC与圆交于点D,D为BC的中点,过D作DE⊥AC于E. (1)求证:AB=AC; (2)求证:DE为⊙O的切线;
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In the 1940s, Pinehaven Park was one of Crafton City's loveliest recreation(娱乐)areas.
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解方程1/x(x+1)+1/(x+1)(x+2)+...+1/(x+8)(x+9)=2x+3/x(x+9)
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