问题1把图1中的格点多边形剪成四部分.要求:(1)沿格点剪裁;(2)四部分全部全等.问题2如图2,由五个相同的正方形组成的“+”字形纸板,请将它剪两刀,然后重新拼成一个正方形.问题3将正方形ABCD按图3(a)比例裁剪后拼成另一个矩形如图3(b),试求(x+y)∶y的值是多少?问题4有直角边分别 Question 1 cuts the grid polygon in Figure 1 into four parts. Requirement: (1) Cut along the grid points; (2) All four parts are equal. Question 2 As shown in Figure 2, “+” consists of five identical squares. ” Shaped cardboard, please cut it two, and then re-spelled into a square. Question 3 will be square ABCD Figure 3 (a) after the proportion of tailoring another rectangle Figure 3 (b), try (x + y ): What is the value of y? Question 4 has right-angled sides respectively