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matlab 关于求偏导数具体值的问题以下是代码：num = 100;for i=1:numa(i) = sym (['a',num2str(i)]);%数组变量endy=a(1) ;for i=2:numy=ya(i) ; %y=a1a2a3...*a_nu 其他

endf=diff(y,a(

标一下主谓宾：I bought my mother a new book for her birthday.she showed me her stamp collection.I often watch sport on TV.I am a writer.I rea 英语

a lot.my fath

——Tom,you are 10 minutes late,please don't be late again next time.——_________.A.Yes,I won't.B.OK,I will C.Yes,I will请问这道题应该选哪一个,为什么?不英语

意思，选项打错了，应该是 A

Having lived in China for 4 decades,I only concluded with two words:live for living.I found that I was so incapable that I could notch 英语

nge society,I

英语翻译Hope there's someoneWho'll take care of me When I die,will I goHope there's someoneWho'll set my heart free Nice to hold when I'm 其他

iredThere's a

英语翻译My daily life is extremely monotonous,I try hard to adapt myself to it.Why?Because I intend to be a good student.I wish to render 英语

ervice to my c

matlab 求和函数问题有一段代码V1=symsum(v1,i,j,1,100,1,100)T1=symsum(t1,i,j,1,100,1,100)C1=symsum(c1,i,j,1,100,1,100)C2=symsum(c2,i,j,1,100,1,100) 其他

3=symsum(c3,i,

Complete the sentences using your own ideas.1.If I get up late tomorrow,2.If I don't finish my homework,3.If I eat 英语

too much lunch

反意疑问句练习3.I wish to shake hands with you,______?a.shall b.may I c.do I d.will I 为什么要用do I 用will I 英语

I won't sleep until mother_(come)back I won't go to see the film tonight because I (lose) the 票I won't sleep until mother_(come)ba 英语

k I won't go t

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