题目1浙教版教材八年级下册第二章《一元二次方程》41页第6题:如图1,要从一块等腰三角形的白铁皮零料上裁出一块长方形白铁皮,已知AB=AC=20cm,要求裁出的长方形白铁皮的面积为75cm~2,应怎样裁?配套教学参考书45页,给出两种裁法:裁法1,2:如图2、图3所示,具体解法参考配套教 Question 1: The second edition of the second chapter “One dollar quadratic equation” of the second edition of the “second unitary equation” of the Zhejiang Education Edition Chapter 4 Problem 6: As shown in Figure 1, from a piece of isosceles triangle white metal cuttings cut out a piece of rectangular white metal, known AB = AC = 20cm, the required rectangular cutout of white iron area of ​​75cm ~ 2, how to cut? Supporting teaching reference book 45 pages, given two kinds of CD: CD 1,2: Figure 3 As shown, the specific solution reference supporting education