I. Implement Matrix Operations in Java
import java.text.DecimalFormat;
/**
* 实现矩阵的运算
*
* @author Regino
* class Matrix:
* - height(): return no. of rows(行数)
* - width(): return no. of columns(列数)
* - add(Matrix target), multiply(double target): Linear Operations(线性运算)
* - multiply(Matrix tar
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