\(y=\frac{12-x}{27-y}=\frac{12}{27}\) so sanh \(\frac{x}{y}va\frac{12}{27}\)
so sanh 12 mu 8 va 27 mu 16 . 16 mu 9
bai 1: so sanh luy thua sau :
a, 2^100 va 1024^9
b, 125^80 va 20^118
c, 9^12 va 27^10
so sanh 21^15 va 27^5
15^12 va 81^3.125^5
3^39 va 11^21
72^45-72^44 va 72^44-72^43
199^20 va 2003^15
1) tim x biết:
a) (19.x +2.5^2) : 14=(13-8)^2 - 4^2
b) 2.3^x=10.3^12+8.27^4
2) so sanh
a) 5^23 va 6.5^22
b)21^15 va 27^5.49^8
c)3^39 va 11^21
d) 7.2^13 va 2^16
cho A=27^51+1/27^52+1 va B=27^52+1/27^53+1 hay so sanh A va B
cho A=27^51+1/27^52+1 va B=27^52+1/27^53+1 hay so sanh A va B
27 x (15 – 12) – 15 x ( 27 – 12 )
A= x+7- (-12 )voi |x|=42
B= 27-x+y biết |x|=9 y=14