goi a la tap hop boi chung cua a , b

goi b la tap hop uoc chung cua 13 a + 8b va 5 a+3b

chung minh rang a=b

Dien tich toan phan cua hinh lap phuong thu nhat la 54 cm2 , dien tich toan phan cua hinh lap phuong thu hai la 216 cm2 . Hoi canh cua hinh lap phuong thu hai dai gap may lan canh cua hinh lap phuong thu nhat . Ai tra loi ca bai giai nhanh nhat trong hom nay minh TICK cho ban nhe ! Nho tra loi that nhanh chi minh nha

san luong lua cua khu vuc a lon hon san luong luc cua khu vua b la 26% mac du dien tich cua khu vuc a chi lon hon khu vuc b la 5% . hoi nanh suat thu hoach cua khu vuc a nhieu hon khu vua b la may phan tram.

                             Giup minh nha , ai tra loi dung nhanh day du minh like cho 3 cai 

san luong lua cua khu vuc a lon hon san luong luc cua khu vua b la 26% mac du dien tich cua khu vuc a chi lon hon khu vuc b la 5% . hoi nanh suat thu hoach cua khu vuc a nhieu hon khu vua b la may phan tram.

                             Giup minh nha , ai tra loi dung nhanh day du minh like cho 3 cai 

Chung minh rang A thuoc Z thi a ( a+2 ) - a ( a-5) -7 a boi cua 7

Giup minh nhe

chung minh rang neu 2 so a,b la 2 so nguyen khac 0 va a la boi cua b;b la boi cua a thi:a=b hoac a=-b

giup mk nhe  mk can gap

Cho S = 1/3 + 1/5 + 1/7 + ... + 1/101

Chung to rang S khong phai la so tu nhien

Ai tra loi nhanh nhat va dung nhat thi minh se tick va ket ban nha!!!

Chung minh rang

a) A=5+5^2+5^3+...+5^8 la boi cua 30

b) B=3+3^2+3^3+...+3^9 la boi cua 273

HELP ME !

cho A=1-3+3^2-3^3+....-3^2003+2^2004 . chung minh rang 4A-1 la luy thua cua 3

giup mik nhanh di may ban