2019年春八年级数学下册第十六章二次根式第7课时二次根式的混合运算(课时小测本)课件(新版)新人教版.ppt

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第十六章 二次根式,第7课时 二次根式的混合运算,课前学习任务单,ab+ac,ac+ad+bc+bd,(a+b)(ab)=a2b2,课前学习任务单,(ab)2=a22ab+b2,am+bm,解:原式=2x2+xy.,解:原式=2x+3y.,解:原式=2+2x.,课前学习任务单,课前学习任务单,略.,课前学习任务单,C,A,略.,课堂小测,非线性循环练 1.(10分)要使式子 有意义,则a的取值范围是( ) A. B. C. D. 2. (10分) 计算 的值是 ( ) A.3 B. C. D.2,D,B,3.(10分)下列二次根式中,是最简二次根式的是( ) A. B. (b0) C. (ab0) D. 4. (20分) 若m=2+ ,n=2 ,求下列各式的值: (1)mn; (2)mn2+m2n.,C,当堂高效测 1. (10分) 下列运算错误的是 ( ) A. B. C. D. 2. (10分) 下列根式中,能与 合并的是 ( ) A. B. C. D.,A,D,3. (10分) 计算: =_. 4. (10分) 计算:5. (10分) 若x= ,求x2-4x+2的值.,3,解:原式=(x-2)2-2=( +2-2)2-2=0.,

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