1.Rectangles R
1 and R
2,and squares S
1,S
2 and S
3 shown below,combine to form a rectangle that is 3322 units wide and 2020 units high.What is the side length of S
2?in units?( ?。?br />如下圖所示,矩形R
1和R
2以及正方形S
1、S
2和S
3組合成一個(gè)寬3322單位、高2020單位的矩形。S
2的邊長(zhǎng)是多少單位?( ?。?br />