2. You still have subtraction, multiplication, division, square root, percentage, and
inverse to cover.
您还需要测试减法、乘法、除法、平方根、百分数,以及倒数。
3. By the use of the combinations nature this paper demonstrates an
inverse matrix extracting method of integer matrix and gives the formula of reverse matrix.
本文利用组合的性质证明了一种整数矩阵求逆矩阵的方法,给出了求逆矩阵的公式,并通过了实例验证。