33.如果x+1/x=4,则x^2/(x^4+x^2+1)等于( )A.4 B.1/4 C.-(1/15) D.1/1534.如图,已知Rt△ABC中,∠A=90°,圆O的圆心在BC上,且分别与AB、AC相切于E、F,若AB=c,AC=b,则圆O的半径等于( )A、根号bc B、(b+c)/ 2 C、 bc
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![33.如果x+1/x=4,则x^2/(x^4+x^2+1)等于( )A.4 B.1/4 C.-(1/15) D.1/1534.如图,已知Rt△ABC中,∠A=90°,圆O的圆心在BC上,且分别与AB、AC相切于E、F,若AB=c,AC=b,则圆O的半径等于( )A、根号bc B、(b+c)/ 2 C、 bc](/uploads/image/z/3824739-27-9.jpg?t=33.%E5%A6%82%E6%9E%9Cx%2B1%2Fx%3D4%2C%E5%88%99x%5E2%2F%28x%5E4%2Bx%5E2%2B1%29%E7%AD%89%E4%BA%8E%28++++%29A.4+B.1%2F4+C.-%281%2F15%29+D.1%2F1534.%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0A%3D90%C2%B0%2C%E5%9C%86O%E7%9A%84%E5%9C%86%E5%BF%83%E5%9C%A8BC%E4%B8%8A%2C%E4%B8%94%E5%88%86%E5%88%AB%E4%B8%8EAB%E3%80%81AC%E7%9B%B8%E5%88%87%E4%BA%8EE%E3%80%81F%2C%E8%8B%A5AB%3Dc%2CAC%3Db%2C%E5%88%99%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%E7%AD%89%E4%BA%8E%EF%BC%88+++%EF%BC%89A%E3%80%81%E6%A0%B9%E5%8F%B7bc++B%E3%80%81%EF%BC%88b%2Bc%EF%BC%89%2F+2++C%E3%80%81+bc)
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