七年级数学上册第二章有理数2.3相反数与绝对值课件1(新版)青岛版.ppt

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2.3相反数与绝对值,第二章 有理数,学校 ,相反数,绝对值,根据绝对值的几何意义,请填空:,2,5,2,0,绝对值的 代数意义,根据绝对值的代数意义,请填空:,5,5,2.4,2.4,3,3,0.5,0.5,5,5,2.4,2.4,3,3,0.5,0.5,互为相反数的两个数的绝对值相等,即:|a|=|-a|,2距离原点6个单位长度的点表示的是什么数?,1在数轴上,距离原点3个单位长度的点表示的是什么数?,3或3,6或6,3.一个数的绝对值是3,那么这个数是:,4.一个数的绝对值是6,那么这个数是:,5. 若|x|=3,那么x=,6. 若|x|=6,那么x=,3或3,6或6,3或3,6或6,相反数,绝对值的几何意义,绝对值的代数意义,互为相反数的两个数的绝对值相等,即:|a|=|-a|,若|x|=a,那么x=,a,两个负数,绝对值大的负数反而小.,

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