2018_2019学年八年级数学上册第二章实数2.5用计算器开方同步练习(新版)北师大版.docx

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15 用计算器开方知能演练提升ZHINENG YANLIAN TISHENG能力提升1.计算 的结果(精确到 0.01)是(可用科学计算器计算或笔算)( )3- 2A.0.30 B.0.31C.0.32 D.0.332.莉莉用计算器比较下列各数的大小,结果如下: ; ; ; .其中正确的个数为( )311 558 5-12 8325 8-22 0,t= 1 .1(s).6.125 运动员跳过横杆后下落的时间约为 1.1 s.9.解 用计算器将已知数依次化为小数约为 1,0.707 1,0.577 4,0.5,0.447 2,0.229 4,0.223 6.可发现这组数的特点是从 1 开始逐渐减少,其中前 5 个数之和最大 .1+ 1 +0.707 1+0.577 4+0.5+0.447 2=3.231 73,故应至少选 5 个数 .12+ 13+ 14+ 15创新应用10.(1)14.14 0.447 2 (2)0.547 7 173.2(3)10b 10c (4)100 (5)两

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