Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)-5x.5x+4.5x+3+(-4)-3=2.511
5x+6.511-2=4+3
5x+17=7-2
5x+17=51
=>x+17=1
=>x=-16
mk bt câu a thôi
b: \(\Leftrightarrow5^x\cdot75+5^x\cdot\dfrac{4}{125}=19\cdot5^{10}\)
\(\Leftrightarrow5^x\simeq24729\)
hay \(x\in\varnothing\)
c: \(\Leftrightarrow2^x\cdot\left(5+3\cdot4\right)=6^{11}\left(11+2\cdot36\right)\)
=>2^x=1771303273
hay \(x\in\varnothing\)
\(\text{a) Ta co }\) \(4^{x+3}-3.4^{x+1}=13.4^{11}\)
\(\Rightarrow\) \(4^{x+1}\left(16-3\right)=13.4^{11}\)
\(\Rightarrow4^{x+1}.13=13.4^{11}\)
\(\Rightarrow4^{x+1}=4^{11}\)
\(\Rightarrow x+1=11\)
\(\Rightarrow\text{x=10}\)
a)
\(4^{x+3}-3.4^{x+1}=13.4^{11}\)
<=> \(4^{x+1}\left(16-3\right)=13.4^{11}\)
<=> \(4^{x+1}.13=13.4^{11}\)
<=> \(4^{x+1}=4^{11}\)
<=> \(x+1=11\)
<=> x=10
2.Tìm x, biết
a,(x-1)3=3 (x-1)3=343
=> (x-1)3=73
=> x -1 = 7
=> x = 8
B, (X-2)4=4096
(X-2)4= 84
=> x - 2 = 8
=> x = 10
C,(2x2-13)4=(-5)4
=> 2x2-13 = -5
=> 2x2 = 8
=> x2 = 4
=> x = 2
Study well
a. (x-1)3 = 343
=> (x-1)3 = 73
=> x - 1 = 7
=> x = 7 + 1
=> x = 8
(2^x-8)^3=(4^x+2^x+5)^3-(4^x+13)^3
(2^x-8)^3=[(4^x+2^x+5)-(4^x+13)]*[(4^x... + (4^x+13)^2]
(2^x-8)^3=(2^x-8)*[(4^x+2^x+5)^2+(4^x+... + (4^x+13)^2]
2^x=8=>x=3
hoặc (2^x-8)^2=(4^x+2^x+5)^2+(4^x+2^x+5)(4^x+... + (4^x+13)^2
(4^x+2^x+5)^2 - (2^x-8)^2+(4^x+2^x+5)(4^x+13) + (4^x+13)^2=0
[(4^x+2^x+5)-(2^x-8)]*[(4^x+2^x+5)+(2^... + (4^x+3)*[(4^x+2^x+5)+(4^x+13)]=0
(4^x+13)*(4^x+2*2^x-3) + (4^x+3)*(2*4^x+2^x+18)=0
(4^x+13)[(4^x+2*2^x-3) + (2*4^x+2^x+18)]=0
4^x+13=0 (VN)
hoặc 3*4^x + 3*2^x +15=0
đặt t=2^x ( t>0)
t^2 + t + 5=0 ptvn
4x+3 - 3.4x+1=13.411
=> 4x+1 +42 -3.4x+1 =13.411
=> 4x+1 (16-3) =13.411
=> 4x+1 .13=13.411
=> x+1 =11
=> x=10