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试卷讲评课

试卷讲评课. 第一章 《 数与式 》. NSZX LJH. 变式: 已知 ,求 的值。. 一、会做而错的题:题 7 ,题 19 ,题 18. 化简:. 解:. 一、会做而错的题:题 7 ,题 19 ,题 18. 变式:.

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试卷讲评课

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  1. 试卷讲评课 第一章《数与式》 NSZX LJH

  2. 变式:已知 ,求 的值。 一、会做而错的题:题7,题19,题18

  3. 化简: 解: 一、会做而错的题:题7,题19,题18

  4. 变式: 1、刘谦的魔术表演风靡全国,小明也学起了刘谦发明了一个魔术盒,当任意实数对(a,b)进入其中时,会得到一个新的实数: 例如把(3,-2)放入其中,就会到 现将实数对(m,-2m)放入其中,得到实数2,则m=________. 二、错而不知为何错的题目:题8,题15

  5. 二、错而不知为何错的题目:题8,题15 2、如图,要使输入出值y大于100,则输入的最小整数x是__________.

  6. y 4 B ② ① ③ ④ x A O 4 8 12 16 三、无从下手题:题9,题21,题22②③ 变式:1、如图,在直角坐标系中,已知点,,对△连续作旋转变换,依次得到三角形①、②、③、④…,则三角形⑩的直角顶点的坐标为.

  7. 2、如图1,是半径为10的一个半圆剪去一个半径为5的半圆,然后沿同一边依次剪去一个更小的半圆(即其半径为前一个被剪掉半圆半径的一半)后,得图2,图3,记第n(n≥2)块的周长为 ,求 - 的值。 … A C B A C D B A C D E B 图1 图2 图3 三、无从下手题:题9,题21,题22②③

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