有关图形面积的计算或证明是常见的数学问题,通常用“割补法”来解决,但是用“割补法”的计算比较繁琐,因而容易出现差错.学习了“平行线间的距离处处相等”以及“等底等高的三角形面积相等”后,就能运用“等积变换”的方法简捷、巧妙地解决这类问题,下面举例说明.例1如图1,已? Calculations or proofs of graphic areas are common mathematical problems. They are usually solved by the “sweep method”, but the computation using the “sweep method” is cumbersome and therefore prone to errors. Learning “the distance between parallel lines everywhere is equal. ”As well as equal areas of triangles with equal height at the bottom,“ we can use the ”equal product transformation" method to solve such problems simply and skillfully. The following examples are illustrated. Example 1 is shown in Figure 1.