在下列运算中,正确的是( )A.a·a=aB.a+a=aC.(a)=aD.a(a+1)=a+1
题型:单选题难度:简单来源:不详
在下列运算中,正确的是( )A.a ·a =a![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817155427-66502.png) | B.a+a=a![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817155427-51815.png) | C.(a ) =a![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817155427-66502.png) | D.a (a+1)=a +1 |
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答案
A. |
解析
试题分析:A.a3•a2=a5,故本选项正确; B.应为a+a=2a,故本选项错误; C.应为(a3)2=a6,故本选项错误; D.应为a2(a+1)=a3+a,故本选项错误. 故选A. |
举一反三
去括号合并同类项:1-(1-2a)-(3 a -2)=( )A.-a +4 | B.a +2 | C.-5a -2 | D.-a +2 |
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(-8x2-16y)- (3x2-9y) ,其中x= ,y=![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817155418-20473.png) |
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