我們知道,是無理數(shù),而無理數(shù)是無限不循環(huán)小數(shù),且 , 我們把1叫做的整數(shù)部分, 叫做的小數(shù)部分,因?yàn)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的整數(shù)部分是1,將這個(gè)數(shù)減去其整數(shù)部分,差就是小數(shù)部分.又例如因?yàn)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E4%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%26lt%3B%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E7%3C%2Fmn%3E%3C%2Fmsqrt%3E%3Cmo%3E%26lt%3B%3C%2Fmo%3E%3Cmsqrt%3E%3Cmn%3E9%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> , 即 , 所以的整數(shù)部分為2,小數(shù)部分為 .
請(qǐng)解答