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.一引入概念有限小数无限循环小数有理数有理数321.4142135......184512.26494......52.23606......3.14159......有理数:有限小数或无限循环小数1.3536710.33无理数:无限不循环小数3,2,5......实数也也圆的周长:C=d1d1=:小结69P课本请查看之探究2?系也2020.二例题讲解:(1)(6),(3.14)3.163.146,3.14.6,3.14.4解的相反数是33333(2)(5),(13)5315,3113.5,13.的相反数是3(443)64(4)3.333,这个数是或:(1)322解原式)32(2303(2)(32)3原式53.三课堂练习21.5532.5:,7,230,,2.解它们的相反数分别是,,,2.57230,.2它们的绝对值分别是(32)322332(32)32232(1,2)(5,0)5:1522OABS解12.271.4121.6.四布置作业2a2aA0A3323B!小心地雷A3B0或:(1)2)23(解原式2(2)(23)22原式32222223230242323232340(23)234232343423244