a) \(818.820=\left(819-1\right)\left(819+1\right)=819^2-1< 819^2\)
Vậy \(818.820< 819^2\)
b) \(14^2=\left(11+3\right)^2=11^2+3^2+2.11.3>11^2+3^2\)
Vậy \(14^2>11^2+3^2\)
c) \(15^2-13^2=\left(15-13\right)\left(15+13\right)=2.28>2.2=2^2\)
Vậy \(15^2-13^2>2^2\)
Tim x biet : |x-3|=x=-5
giup minh nhe minh se cam on va hau ta
Co hai so nguyen a,b khac nhau nao ma a chia het cho b va b chia het cho a khong?
ban nao pt thi giai giup minh nha cam on cac ban nhieu lam
Cho goc xOz va yOz la 2 gocke bu,goi Oa va Ob lan luot la cac tia phan giaccua goc xOz va goc yOz chung to goc aOb =90 do.
<ban nao bit lam thi giup minh nhe,ghi ca cach lam ra nhe.Cam on cac ban nhieu>
Cho a/b <1 va a,b thuoc N, b khong bang 0, c > 0. Chung minh a/b < a+c/b+c
Giup minh nhe! Cam on
cau b -8 chia het x va 12 chia het x
cau c x chia het4 , x chia het -6 va -20 <x<-10
ai giup minh thi lam nhanh nha minh cam on truoc
1.tim 2 so tu nhien co hieu bang 2002 va tich bang 2006.
2.cho 100 so tu nhien 1,2,3,4,....100.
co the chon duoc 71 so tu nhien sao cho tong cua chung bang tong cua 29 so con lai khong
3.mot so chan co 4 chu so , trong do so tao boi chu so hang tram va hang chuc gap 3 lan chu so hang nghin va gap 2 lan chu so hang don vi .
[CAC BAN GHI LOI GIAI GIUP MINH NHE MINH CAM ON]
Ban hung dung các so -2,3,5 va chu a ra moi bai toan cho ban hung lam. Ban hung dung may tinh ra ket qua dung la -7776. Theo em ban hung da ra de toan cho ban hung nhu the nao? Viet moi so CHI dung moi lan . Em hay viet bai toan do va trinh bay loi giai
GIUP EM VOI MAY ANH CHI OI VA LAM NHANH LEN , EM CAM ON
tren tia Ox ve ba doan thang OA,OB,OC sao cho OA=2cm,OB=5cm,OC=8cm.So sanh BC va BA (lam loi giai ve phep tinh ra giup minh nha)cam on!!!!!
tim cac so tu nhien a va b de thoa man (5a+7b)/(6a+5b)=29/28 va (a;b)=1
ai lam duoc em cam on nhieu va hau ta han hoi
