1.(2015山西，20)—ThisisthetimethatIcometoParis.Ihavebeenheretwice.—Metoo.TheworldissolargethatIwanttoseemoreofit.A.firstB.secondC.third
1.(2015 山西，20) — This is the time that I come to Paris. I have been here twice.
—Me too.The world is so large that I want to see more of it.
A. first B. second C. third
S=(1+1/1*2+(2+1/2*3)+(3+1/3*4)+...+(20+1/20*21)S= 2020-04-27 …
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 …
如果记y=x^2/(1+x^2)=f（x）.则f（1）表示当x=1是y的值,即f（1）=1^2/( 2020-06-12 …
已知a/(a^2+1)=1/2,求a^2/(a^4+1)的值由a/(a^2+1)=1/2,知a≠0 2020-06-14 …
观察按下列规律排成的一列数：1\1,1\2,2\1,1\2,2\2,3\1,1\4,2\3,3\2 2020-06-25 …
计算下列各式（1）1-1/2^2（2）（1-1/2^2)(1-1/3^2)(3)(1-1/2^2) 2020-07-18 …
英语作文改,病了,能交就行了.(2)Third,Barack-Obamastartedtotalka 2020-11-05 …
按要求写单词1.thei(主格)2.third（基数词）3.have（第三人称单数）4.women( 2021-01-29 …