乘法公式的探究及应用．

（1）将左图阴影部分裁剪下来，重新拼成一个长方形（右图所示），那么这个长方形的宽是____，长是____ ，面积是____ 

（2）比较左、右两图的阴影部分面积，可以得到乘法公式____．（用式子表达）

如图，数轴上A、B两点表示的数分别为$\sqrt{2}$和5.1，则A、B两点之间表示整数的点共有（　　）

给下列句子选择对应的图片。

A.        B.      C.       D.

材料与人类生活密切相关。下列物品是由有机合成材料制成的是

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