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fen shi dan yuan ce shi ti
Author(s): LIN Wangchun
Pages: 26-
28
Year: 2006
Issue:
3
Journal: School Journal of Mathematics
Keyword: 代数式; 分式方程; 施工方案; 单元测试; 化简; 原方程; 工程款; 用水价格; 领导小组; 工期;
Abstract: <正>一、填空题 1.在-1/2x,1/n+2,2/x-3/y,2/x-3/y,3x~2+1/3y~3,2/x+2-(y-2)~2,2x/π+2中,属于分式的是 2.在分式4x/x~2-1中.当x____时,它有意义;在分式|x|-3/x~2+3x中.当x____时.分式的值为0. 3.化简:-x/x~2-3x·(x~2-6x+9)=____. 4.若x-1/x=6,则x~2+/x~2的值为____. 5.某油库有汽油 mL,计划每天用去nL,实际用油每天节约了dL,那么这些油可以用____天,比原计划多用____天. 6.当x=____时、代数式1/x+2的值比代数式1-x/2+x的值小2.
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