（4.5+5.5）*3.6=36
其简便方法是(4.5+5.5)X3.6=36。
4.5×3.6+5.5×3.6＝(4.5+5.5)×3.6＝10×3.6＝36
4.5X3.6+5.5X3.6=（4.5+5.5）X3.6=10X3.6=36
