seven square times the cubic of nine plus *Capital A equals to the negative second power of **small b minus two third.
two third - 三分之二
negative second power = 负二次方
-上文中,"negative second power of **small b minus two third"就有negative second power of (small b minus two third)的意思了
*Capital A = 大写A
**small b = 小写 b
9^3+A的话是叫nine cubic plus A (Capital A)
（b^-2）-2/3的话就是b (small b) to the negative second power minus two third
***b to the negative second power 就是(b^-2)的意思了