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【简答题】
Choose an appropriate determiner to fill in each of the blanks: _________ candidates are girls. A. Half the B. The half C. Their half D. Half a
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【简答题】解方程：（2y﹣1） 2 ﹣3（2y﹣1）+2=0．
【简答题】微分方程2y"+2y'+y=0的通解为______。
【单选题】听力原文：M: Hello, Julia. Why are you in such a hurry? W :Hello, Peter. I' m going to the theatre. They say there’s a lecture on how to improve the skills of listening. Do you want to go with me? M: Oh, n...
A.
he's very busy
B.
the traffic is busy
C.
he has already heard it
【单选题】方程y′′+2y′=2x2−1y″+2y′=2x2−1的一个特解形如
A.
y = a x 3 + b x 2 + c x + d " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 3 + b x 2 + c x + d y=ax3+bx2+cx+d ;
B.
y = a x 2 + b x + c " role="presentation" style="display: inline-block; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 2 + b x + c y=ax2+bx+c ;
C.
y = a x 4 + b x 3 + c x 2 + d x + e " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 4 + b x 3 + c x 2 + d x + e y=ax4+bx3+cx2+dx+e ;
D.
y = a x + b " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x + b y=ax+b
【简答题】函数y=e x cosx，验证函数y满足方程y"-2y'+2y=0．
【简答题】方程y"-2y'+2y=e x 的通解为
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