a)
Dễ thấy:
\(-\frac{1274}{2530}< 0< 1,2\)
\(\Rightarrow-\frac{1274}{2530}< 1,2\)
b)
Ta có :
\(25^{15}=\left(5^2\right)^{15}=5^{30}\)
\(8^{10}.3^{30}=\left(2^3\right)^{10}.3^{30}=2^{30}.3^{30}=6^{30}\)
Vì \(5^{30}< 6^{30}\)
=> \(25^{15}< 8^{10}.3^{30}\)
tim 2 so x va y biet
a, \(\frac{x}{3}\)=\(\frac{y}{7}\) va x+y=20
b, \(\frac{x}{5}\)=\(\frac{y}{2}\)vax-y=6
ti so cua hai so a va b la 5/8. ti so cua hai so c va d la 15/26 ti so cua a va c la bao nhieu
tim 3 so tu nhien lien tiep trong do so nho la so chan va trong do co 1 so chia het cho 9 biet tong 3 so do la 1 so co 3 chu so va co nhung dac diem sau
-chia het cho 5
-tong chu so hang tram va hang don vi chia het cho 9
-chu so hang chuc la chan
So sanh 2 phan so sau khong quy dong...
\(\frac{5}{-12}\) va \(\frac{-6}{17}\)
Tim a , b , c neu :
a ) 5a - 3b - 3c = - 536 va \(\frac{a}{4}=\frac{b}{6};\frac{b}{5}=\frac{c}{8}\)
b ) a2 + 3b2 - 2c2 = -16 va \(\frac{a}{2}=\frac{b}{3}=\frac{c}{4}\)
tim so tu nhien a va b thoa man 11/17<a/b<23/29 va 8b-9a=31
Mot nguoi dem cam ra cho ban ngay dau ban duoc 1/3 so cam va 10 qua ,lan thu hai ban duoc 1/2 so cam con lai va 10qua , lan thu ba ban duoc 75 qua thi con lai 10qua .tinh so cam nguoi do dem ban
Cho \(\frac{2x+1}{5}=\frac{3y-2}{7}=\frac{2x+3y-1}{6x}\) . Tim x va y