2.2.平方根（第一课时）课件 2023—2024学年北师大版数学八年级上册

2.我们已经学... text has been truncated due to evaluation version limitation. ？ 它们中互为... text has been truncated due to evaluation version limitation. ？ 答：加法、减... text has been truncated due to evaluation version limitation.。 加法与减法... text has been truncated due to evaluation version limitation. 乘方与 ？互逆？ 1.你还知道1—20的平方分别... text has been truncated due to evaluation version limitation. 往事知多少... text has been truncated due to evaluation version limitation. 2.2平方根 （第一课时... text has been truncated due to evaluation version limitation. 学习目标： （1）了解算术... text has been truncated due to evaluation version limitation. （2）会求一些... text has been truncated due to evaluation version limitation. 并用算术平... text has been truncated due to evaluation version limitation. 学习重点： （1）算术平方... text has been truncated due to evaluation version limitation. （2）算术平方根... text has been truncated due to evaluation version limitation.求法． 正方形的面... text has been truncated due to evaluation version limitation. 边长 1 9 16 36 0.25 身边小事 即：已知一个正... text has been truncated due to evaluation version limitation.,求这个数 1 3 4 6 0.5 像正数 32=9, 把正数 3 叫做9的算术平方... text has been truncated due to evaluation version limitation.. … 已知正方形... text has been truncated due to evaluation version limitation., 求边长 像正数32=9, 把正数3 叫做9的算术平方根. 像正数22=4, 把正数2 叫做4的算术平方根. 像正数42=16, 把正数4 叫做16的算术平方根. 像正数52=25, 把正数5 叫做25的算术平方根. 像正数x2=a, 把正数x 叫做a的算术平方根. 定义： 一般地，如... text has been truncated due to evaluation version limitation.正数 x 的平方等于... text has been truncated due to evaluation version limitation.a（x2 =a），那么这... text has been truncated due to evaluation version limitation.x 就叫做 a 的 算术平方根 a 的算术平... text has been truncated due to evaluation version limitation. 读作 “ 根号a ” 根号 被开方数 规定：0的算术平... text has been truncated due to evaluation version limitation. 定义： 一般地，如... text has been truncated due to evaluation version limitation.x 的平方等于... text has been truncated due to evaluation version limitation.a（x2 =a），那么这... text has been tr