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day2.py

+i = 5   # 行
+j = 3   # 列
+# 使用变量i和j，代替乘法算式里面的元素，打印出单个乘法算式
+for i in range(1,10):
+    for j in range(1,i+1):
+
+        print(j,"x",i,"=",(j*i),end="  ")
+    print()