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题目如图1是一个由5张纸片拼成的平行四边形,相邻纸片之间互不重叠也无缝隙,其中两张等腰直角三角形纸片的面积都为S_1,另两张直角三角形纸片的面积都为S_2,中间一张正方形纸片的面积为S_3,则这个平行四边形的面积一定可以表示为().A.4S_1B.4S_2C.4S_2+S_3D.3S_1+4S_3此题图文结合,简洁明了,以直角三角形和正方形为素材,以赵爽弦图的适当变形与平方差公式的几何解释图形的合理组合为背景,以生成的动态平行四边形面积的定
The title is shown in Figure 1 is a parallelogram composed of five pieces of paper, the adjacent pieces of paper are not overlapped with each other without gaps, of which two isosceles right triangle paper area is S_1, the other two right-angled triangle The area of the paper is S_2, the area of a square paper in the middle is S_3, then the area of this parallelogram can certainly be expressed as () .A.4S_1B.4S_2C.4S_2 + S_3D.3S_1 + 4S_3 , Concise and clear, the right triangle and square as the material to the appropriate combination of Zhao Shuang chord diagram and the geometric variation of the formula to explain the geometric shape of the background to the background of the generated dynamic parallelogram area