ThursdayMartin:We'redoingourpresentationtotheseminar(研讨会)groupnextMonday.1.(Can/May)youemailitsmembersrightaway?Linda:2.(Must/Should)Idoitnow?Martin:Wellwc3.(musthavetold/shouldhavetold)themearlierr
Thursday
Martin: We' re doing our presentation to the seminar (研讨会) group next Monday. 1.(Can / May) you email its members right away?
Linda: 2. (Must / Should) I do it now?
Martin: Well wc 3. (must have told /should have told) them earlier really.
Linda: Oh all right then.
Friday
Neil: I've had an email about Martin and Linda's presentation on Monday.
Ellie: That's strange I haven’t. Do you think I 4. (must / ought to) call them?
Neil: No you 5. (mustn't / don't have to) . It's probably not connected with your research area.
Monday
Neil: Hi Martin. V ve come a bit early in case you
wanted help to get the room ready. But I see I 6. (needn t bother / needn’t have bothered) . You’ve got everything organised.
Martin: Isn’ t Ellie with you?
Neil: No she didn't get an email from you so we
thought the presentation wasn't relevant to her work.
Martin: Oh dear. Linda 7. (must send /must have sent) the email to the wrong address.
Neil: Where is she now? She 8. (must /should) be here.
Martin: I don't know. She 9. (must have forgotten / should have forgotten) we’ re doing this presentation. She's so unreliable.
探究题:(x-1)(x+1)=x^2-1(x-1)(x^2+x+1)=x^3-1探究题:(x-1)( 2020-03-30 …
1/1,-1/2,-2/1,1/3,2/2,1/3,-1/4,-2/3,-3/2,-4/1,1/5 2020-04-09 …
1/2*101/100=101/200这一步是因为什么这么做的?原题是1-1/2^2)(1-1/3 2020-05-14 …
谁会用MATLAB计算 权向量矩阵是A=[1,1/2,3,1,6,8,9,1/2 2,1,5,2, 2020-05-15 …
2^2-1^2=2*1+13^2-2^2=2*2+14^2-3^2=2*3+1……(n+1)^2- 2020-05-19 …
天才进1,1,2,1,2,1,2,3,3,1,3,2,1,2,3,3,1,3,2,1,3,2,3, 2020-05-21 …
1^2/1^3-(1^2+2^2)/(1^3+2^3)+.-(1^2+2^2+...+80^2)/ 2020-06-02 …
设Tn=1/2^0+2/2+3/2^3+…+n/2^(n-1)(1)(1/2)*(1)得:(1/2 2020-06-02 …
1/(1^2)+1/(2^2)+1/(3^2)+1/(4^2)+1/(5^2)+1/(6^2)+1 2020-06-11 …
1+1/1*3+1/2*3+1/2*5+1/3*5+1/3*7+1/4*7+1/4*9原式=2*[ 2020-06-11 …