下列计算正确的是( ). A. B. C. D
下列计算正确的是().A.B.C.D....
下列计算正确的是( ). A. B. C. D.
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有爱435eXd
推荐于2016-06-01
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分析:按照二次根式的加减法分别计算各选项,然后将得出的结果与选项的结果进行对比,继而可得出答案. A、 ![](https://iknow-pic.cdn.bcebos.com/6a63f6246b600c335f08857a194c510fd9f9a10b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,故本选项错误; B、 ![](https://iknow-pic.cdn.bcebos.com/f7246b600c33874432b474ce520fd9f9d72aa00b?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) =5,故本选项错误; C ![](https://iknow-pic.cdn.bcebos.com/500fd9f9d72a6059fab5baa82b34349b023bbadf?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,故本选项错误; D、 ![](https://iknow-pic.cdn.bcebos.com/d8f9d72a6059252d34b246b6379b033b5ab5b9df?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto) ,故本选项正确. 故选D. 点评:此题考查了二次根式的加减法,属于基础题,要掌握同类二次根式的判断及合并法则,比较简单. |
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