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数形结合问题是数形结合思想应用的重要载体,现已成为中考命题的一个热点.下面以与整式有关的数形结合问题为例说明如下.一与整式的加减有关的数形结合题例1如图1,阴影部分的面积是().A.7/2xy B.9/2C.4xy D.2xy分析:可采用分割或拼补方法计算.如采用分割的方法,知图形的面积可分为两个长方形的面积,得(2x-0.5x)·2y+0.5x·y=3xy+0.5xy=7/2xy.故应选A.二与整式乘法有关的数形结合题
Number-form combination is the application of number-shape combination of important carrier, has now become a hot topic in the test. The following is related to integer-type combination of problems as an example as follows .And integral addition and subtraction related to the number of combination Example 1 Figure 1, the area of the shaded area is () .A.7 / 2xy B.9 / 2C.4xy D.2xy analysis: can be used to calculate the method of segmentation or interpolation, such as the use of segmentation method, the area of the graph Can be divided into two rectangular area, obtained (2x-0.5x) · 2y + 0.5x · y = 3xy + 0.5xy = 7 / 2xy. Therefore, A. should be selected A. Integer multiplication associated with the shape of the combination of questions