【简答题】3. They ____ in my
math class.
【简答题】90°-46°27′=______,180°-42°35′29″=______.
【简答题】某种纸张的厚度为0.00873 cm,用科学记数法表示为( )cm。
【简答题】根据估算填. 81×30≈______×______=______; 42×29≈______×______=______.
【单选题】My students are all quiet.Even after class, my students spend ___as they can playing outside.
【简答题】Students in my class try to speak English all the time. They improve their speaking quickly.
【单选题】下列判断错误的是()
B.
阶梯型矩阵中,每行的第一个非零元前面的零元素的个数,随着行数的增加而增加
D.
若A为 矩阵,则,r(A)=m或者r(A)=n
【简答题】阅读理解。 What do you usually do after class? When class is over, most students in my class I go out to relax. We have a twenty-minute break (休息) between classes. Look! Some students are in the playground...
【单选题】在回归模型中,下列哪一项在权衡欠拟合(under-fitting)和过拟合(over-fitting)中影响最大?
B.
更新权重 w 时,使用的是矩阵求逆还是梯度下降
【简答题】先估一估,再用竖式计算(加▲要验算). 38×42≈ 63×57≈ 80×29≈ 38×42= ▲63×57= 80×29=