训练线性函数import numpy as npimport tensorflow.keras as keras# 构建模型model = keras.Sequential([keras.layers.Dense(units=1,input_shape=[1])])# optimizer优化，loss损失model.compile(optimizer='sgd', loss='mean_squar

第三章：关系数据库标准语句SQL（连接、嵌套、集合查询）1.连接查询查询每个学生及其选修课程的情况SELECT Student.,SC.FROM Student,SCWHERE Student.Sno=SC.Sno2.自然连接SELECT Student.Sno,Sname,Ssex,Sdept,Cno,GradeFROM Student,SCWHERE Student.Sno=...

要打印九九乘法表，首先要打印出乘法表大致的形状```python#row表示行数row=1while row<=9:#列数col=1while col<=row:#让print保持在同一行print("*",end="")col+=1#换行print("")row...