\(5^x\). \(5^{x+1}\). \(5^{x+2}\)\(\le\)1000000000000000000: \(2^{18}\).
\(5^x\)x \(5^{x+1}\)+ \(5^{x+2}\)\(\le\) 1000000000000000000: \(2^{18}\).
Tìm x biết 5x. 5x+1.5x+2 < 1000000000000000000 :218
tìm x
5^x.5^x+1.5^x+2< hoặc = 1000000000000000000:2^18
tìm x biết
5x . 5x+1 . 5x+2 <_ 1000000000000000000 : 218
tìm x thuộc N, biết:
\(^{5^x.5^{x+1}.5^{x+2}}\) bé hơn hoặc =1000000000000000000:\(2^{18}\)
\(5^x.5^{x+1}.5^{x+2}\le10^{18}:2^{18}\)
\(5^x.5^x.5.5^x.5^2\le5^{18}.2^{18}:2^{18}\)
\(5^{3x}.5^3\le5^{18}\)
\(5^3.5^x.5^3\le5^{18}\)
\(5^x\le5^{18}:5^6\)
\(5^x\le5^{12}\)
\(\Rightarrow x\le12\)
\(\Rightarrow x\in\left\{0,1,2,3,4,5,6,7,8,9,10,11,12\right\}\)
5x x5x+1x5x+1<1000000000000000000:218
\(\Rightarrow5^{3x+2}< 10^{18}\div2^{18}\)
\(\Rightarrow5^{3x+2}< 5^{18}\)
\(3x+2< 18\)
\(x< \frac{16}{3}\)
Tìm x
a)16^x<128^4
b)5^x . 5^x+1 . 5^x+2=<1000000000000000000:2^12
Chỗ =< là nhỏ hơn hoặc bằng ; có 18 chữ số 0
Tìm x
5xX5x+1X5x+2 < hoặc = 1000000000000000000 /218
1 tìm x thuộc n , biết
a,5x . 5x +1 . 5x+2 < hoặc = 1000000000000000000 : 218
2 cho S = 1+2+22 +.........................+29
so sánh S với 5.28