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初中课本代数第三册第72页中指出:在分母有理化时,有时也可先分解因式,再约分,并以x-y=(x<sup>1/2</sup>+y<sup>1/2</sup>)(x<sup>1/2</sup>-y<sup>1/2</sup>)作为这个方法的实例,明确地把x-y化成x<sup>1/2</sup>+y<sup>1/2</sup>与x<sup>1/2</s