CMR : S = 1/5+1/13+1/14+1/15+1/61+1/62+1/63 < 1/2
minh thach ai lam duoc bai nay
bai 1:timx,y la so tu nhien
[x-1] [y-3]=5
bai 2:so sanh
3300 va 5200
giup minh nhe
Bai 1.Tim x, y biet :
2x(3y-2)+(3y-2) = -55
Bai 2 .a) So sanh : -22/45 va -51/103
b) So sanh A = 2009^2009 +1 / 2009^2010 va B = 2009^2010-2/2009^2011-2
Bai 3 :
a)Tim so tu nhien co 3 chu so , biet rang khi chia so do cho cac so 25, 28,35thi duoc cac so du lan luot la 5,8,15
b)Tim x: (x+1)+(x+2)+(x+3)+...+(x+100)=205550
ke ten mot so lan dieu dan ca va cho biet bai do thuoc vung , mien nao tren dat nuoc ta .
tai sao chung ta phai giu gin , hoc tap va phat trien dan ca ?
Bai 1: So sanh:
291 va 535
Bai 2: Tim x:
5x+2 =625
cac ban oi gip minh voi bai so sanh :6mu7 va 12mu5
em hay tim ucln ( 35;105) bang hai cach khac nhau , roi so sanh ket qua
goi y cua bai toan
thuat toan o - clit tim ucln cua hai so
giup minh voi huhu
bai 1:so sanh 2 luy thua sau: 333444 va 444333
5^6 .......6^9
bai so sanh luy thua
giup minh voi minh luoi tu giai lam