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Ta có:
\(5^{2017}.5^{x-2}=5^{2015}\)
\(\Rightarrow5^{x-2}=5^{2015}-5^{2017}=5^{2015-2017}\)
\(\Rightarrow5^{x-2}=5^{-2}\)
\(\Leftrightarrow5=5\)
\(\Leftrightarrow x-2=-2\Leftrightarrow x=\left(-2\right)+2=0\)
Vậy x = 0
\(5^{x+1}-5^x=100
\)
\(5^x.5-5^x=100\)
\(5^x.\left(5-1\right)=100\)
\(5^x.4=100\)
\(5^x=100:4\)
\(5^x=25\)
\(5^x=5^2\)
\(=>x=2\)
Vậy x=2
(7*x-11)^3 = 2^5 * 5^2 +200
(7*x-11)^3 = 32*25+200
(7*x-11)^3=800+200
(7*x-11)^3=1000
=>(7*x-11)^3=(1000)^3
7*x-11=1000
7x=1000+11
7x=1011
x=1011/7
(7.x-11)^3=2^5.5^2+200
(7.x-11)^3=32.25+200
(7.x-11)^3=800+200
(7.x-11)^3=1000
(7.x-11)^3=10^3
7x-11=10
7x=10+11
7x=21
x=21/7
x=3
\(a.2^6.\left(x-2\right)=104\)
\(x-2=104:2^6\)
\(x-2=1,652\)
\(x=1,625+2\)
\(x=3,625\)
\(b.2\times4^{x+1}=128\)
\(4^{x+1}=128:2\)
\(4^{x+1}=64\)
\(4^{x+1}=4^3\)
\(\Rightarrow x+1=3\)
\(x=3-1\)
\(\Leftrightarrow x=3\)
\(c.227-5\left(x+8\right)=3^6:3^3\)
\(227-5\left(x+8\right)=3^3\)
\(227-5\left(x+8\right)=27\)
\(5\left(x+8\right)=227-27\)
\(5\left(x+8\right)=200\)
\(x+8=200:5\)
\(x+8=40\)
\(x=40-8\)
\(x=32\)
ủng hộ mk nha, chắc đúng đó
cả tháng nay ms online lại
A, 2^5 x 8^4 = 2^5 x (2^3)^4 B,25^6 x 125^3=(5^2)^6 x (5^3)^3
= 2^5 x 2^12 =5^12 x 5^9
=2^17 =5^21
5x-1_5x=100
5x.5-5x=100
5x(5-1)=100
5x=100:4
5x=25
5x=52
vậy x =2
k cho minh nha
\(\left(5^2\times2^3-7^3\times2\right)\div2\times6-7\div2^5\)
\(=\left(25\times8-343\times2\right)\div2\times6-7\div32\)
\(=\left(200-686\right)\div2\times6-7\div32\)
\(=-486\div2\times6-7\div32\)
\(=-1458-0,21875\)
\(=-1458,21875\)
5x - 1 = 52
⇒ x - 1 = 2
⇒ x = 2 + 1
⇒ x = 3
Vậy x = 3