下列各式中,属于二次根式的有( )①根号下:15②根号下:1/a③根号下:a²+b²④根号下:a²b⑤根号下:2ab×3bc⑥根号下:5又1/2(就是2分之11)A.2个 B.3个 C.4个 D.5个给出正确答案,还有理由啊,是不
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![下列各式中,属于二次根式的有( )①根号下:15②根号下:1/a③根号下:a²+b²④根号下:a²b⑤根号下:2ab×3bc⑥根号下:5又1/2(就是2分之11)A.2个 B.3个 C.4个 D.5个给出正确答案,还有理由啊,是不](/uploads/image/z/5932010-2-0.jpg?t=%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E4%B8%AD%2C%E5%B1%9E%E4%BA%8E%E4%BA%8C%E6%AC%A1%E6%A0%B9%E5%BC%8F%E7%9A%84%E6%9C%89%28+%29%E2%91%A0%E6%A0%B9%E5%8F%B7%E4%B8%8B%3A15%E2%91%A1%E6%A0%B9%E5%8F%B7%E4%B8%8B%3A1%2Fa%E2%91%A2%E6%A0%B9%E5%8F%B7%E4%B8%8B%3Aa%26sup2%3B%2Bb%26sup2%3B%E2%91%A3%E6%A0%B9%E5%8F%B7%E4%B8%8B%3Aa%26sup2%3Bb%E2%91%A4%E6%A0%B9%E5%8F%B7%E4%B8%8B%3A2ab%C3%973bc%E2%91%A5%E6%A0%B9%E5%8F%B7%E4%B8%8B%3A5%E5%8F%881%2F2%28%E5%B0%B1%E6%98%AF2%E5%88%86%E4%B9%8B11%29A.2%E4%B8%AA+B.3%E4%B8%AA+C.4%E4%B8%AA+D.5%E4%B8%AA%E7%BB%99%E5%87%BA%E6%AD%A3%E7%A1%AE%E7%AD%94%E6%A1%88%2C%E8%BF%98%E6%9C%89%E7%90%86%E7%94%B1%E5%95%8A%2C%E6%98%AF%E4%B8%8D)
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