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> 实数a、b在数轴上的位置如图所示,则化简=__________-八年级数学
实数a、b在数轴上的位置如图所示,则化简=__________-八年级数学
题目简介
实数a、b在数轴上的位置如图所示,则化简=__________-八年级数学
题目详情
实数a、b在数轴上的位置如图所示,则化简
=__________
题型:填空题
难度:偏易
来源:不详
答案
-2a
由数轴可知a<0,b>0,a-b<0,根据二次根式的性质
=|a|,化简计算.
解:∵a<0,b>0,a-b<0,
∴
-
+
,
=|a|-|b|-|a-b|,
=-a-b-a+b=-2a.
故本题答案为:-2a.
上一篇 :
下列各式正确的是()A.B.C.D.-八年级
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=__________,的立方根是________
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题目简介
实数a、b在数轴上的位置如图所示,则化简=__________-八年级数学
题目详情
答案
解:∵a<0,b>0,a-b<0,
∴
=|a|-|b|-|a-b|,
=-a-b-a+b=-2a.
故本题答案为:-2a.