二次根式的加减.pptx

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1、21.1二次根式的加减（1）蒲美杰把下列各根式化简311(8)45(7)32(6)21)5(50(4)18(3)48(2)12)1(分母有理化：1881825=5+?23=+归纳：如果几个最简二次根式被开方数相同，那么这几个二次根式叫做同类二次根式，在做加减运算时只有同类二次根式可以合并.333222利用了分配律21.3二次根式的加减思考:归纳：二次根式加减时,可以先将二次根式化成最简二次根式,再将被开方数相同的二次根式进行合并.二次根式的加减类似于整式的加减练习:P161,2,31.判断下列计算是

2、否正确:练一练:（　）（　）（　）（　）2.若最简二次根式与能够合并，则x=？3.若　与最简二次根式　　　能够合并，则a=?××××计算:提高练习:（3）合并被开方数相同的二次根式。一化二找三合并二次根式加减法的步骤：（1）将每个二次根式化为最简二次根式；（2）找出其中被开方数相同的二次根式；小结s!r!q#qZpZoYoXnXmWlVlUkUjTjSiShRhQgQfPeOeNdNcMcLbLaKaJ9J8I7H7G6G5F5E4E3D3C2B1B0A0z+z-y-x)x(w(v*u&u%t%s$

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