Sắp xếp : Our/a/in/makes/volunteer/different/community

A,Tính tổng: S=1-2+2^2-2^3+...+2^100 B,Cho a là số nguyên tố lớn hơn 3. Chứng minh rằng (a-1).(a+4) chia hết cho 6

Tính giá trị của biểu thức1:x+8-x-22 với x =2010 2:-x-a+12+với x=-98;a=99

Một hình thang có đáy lơn 60cm;đáy bé 38cm.Nếu kéo dài đáy lớn thêm 20cm và đáy bé 12cm về cùng một phía thì diện tích sẽ tăng lên 512cm2.Tính S hình thang lúc đầu.

Cho x,y,z >0. Chung minh: 2x/(x^6+y^4)+2y/(y^6+z^4)+2z/(z^6+x^4)<=1/x^4+1/y^4+1/z^4

a,|2x+9|=15 b,25-|3-x|=10 Tìm x

Rewrite each of the following sentences,using the word given keeping its meaning unchanged 1.charles lives quite near his Aunt's house (DOESN'T) .................................... 2.To do morning exercises regularly is good for your health (health) ,......................... 3.can the little boy look after himself when his mother is way? (take) .............................. 4.it is not necessary for you to finish your asignment this evening (need) ...................................... ....... 5.ha ha a toothache yesterday. We had a yesterday (so)

We're going to(1)........a movie this weekend. Will you (2)......us That's a good idea. Yes, i'd love (3) There's a good movie(4)....at the Thang Loi cinema(5).....saturday evening Where would you like to meet? Let's meet(6).....lan's house, and we all go to the movie theater together. Do you also(7).............lan to go to the movie theater?