\(5.3^x=5.3^4\)
\(5.3^x=7.3^5-2:3^5\)
a, \(5.3^x=5.3^4\)
b, \(5.3^x=7.3^5-2:3^5\)
c, \(5^{x+4}-3.5^{x+3}=2.5^{11}\)
d, \(2^x+2^{x+1}+2^{x+2}+2^{x+3}+2^{x+4}+2^{x+5}=480\)
Làm đầy theo tính ra kết quả thì mk với tik
c, \(5^{x+4}-3\cdot5^{x+3}=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}\cdot5-3\cdot5^{x+3}=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}\left(5-3\right)=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}\cdot2=2\cdot5^{11}\)
\(\Leftrightarrow5^{x+3}=5^{11}\)
\(\Leftrightarrow x+3=11\)
\(\Leftrightarrow x=8\)
Vậy x = 8
d, \(2^x+2^{x+1}+2^{x+2}+2^{x+3}+2^{x+4}+2^{x+5}=480\)
\(\Leftrightarrow2^x\left(1+2+2^2+2^3+2^4+2^5\right)=480\)
\(\Leftrightarrow2^x\cdot63=480\)
\(\Leftrightarrow2^x=\frac{160}{21}\)
\(\Leftrightarrow x\approx2,93\)
bn nào trả lời hộ mk ik
đang gấp !!!
Bài 2 )
\(5.3^x=5.3^4\)
\(9.5^3=6.5^0+3.5^0\)
\(7.3^x=5.3^7+2.3^7\)
giải đầy đủ ra nhé
nhanh mk cần gấp
5.3x=5.34
<=> 3x=34( chia cả hai vế cho 5)
<=> x=4
7.3x=5.37+2.37
<=> 7.3x=37.(5+2)
<=> 7.3x=37.7
<=> 3x=37(chia cả hai vế cho 7)
<=> x=7
Tìm số nguyên x , nếu biết
1. 7.4^x=7.4^3
2.3/2.5^x =3/2.5^12
3 . 2^x=2.2^8
4. 5.3^x=7.3^5-2.3^5
1) \(7.4^x=7.4^3\Leftrightarrow4^x=4^3;x=3\)
2) \(\frac{3}{2.5^x}=\frac{3}{2.5^{12}}\Leftrightarrow5^x=5^{12};x=12\)
\(2^x=2.2^8=2^9;x=9\)
4) \(5.3^x=7.3^5-2.3^5\Leftrightarrow5.3^x=3^5.\left(7-2\right)\)
\(\Leftrightarrow3^5.x=3^5.5;x=5\)
7.3+9.x+(-9.8)-5.3=1
Tìm x biết
1)\(3^{x+2}+4\cdot3^{x+1}=7.3^6\)
2)\(5.3^{x+6}=2.3^5+3.3^5\)
5.3\(^{x+2}\) -5=2\(^4\) .5\(^2\)
\(5\cdot3^{x+2}-5=2^4\cdot5^2\)
\(\Rightarrow5\left(3^{x+2}-1\right)=2^4\cdot5^2\)
\(\Rightarrow3^{x+2}-1=\dfrac{2^4\cdot5^2}{5}\)
\(\Rightarrow3^{x+2}-1=16\cdot5\)
\(\Rightarrow3^{x+2}-1=80\)
\(\Rightarrow3^{x+2}=80+1\)
\(\Rightarrow3^{x+2}=81\)
\(\Rightarrow3^{x+2}=3^4\)
\(\Rightarrow x+2=4\)
\(\Rightarrow x=2\)
Vậy: x = 2
\(5\cdot3^{x+2}-5=2^4\cdot5^2\\\Rightarrow 5\cdot(3^{x+2}-1)=5\cdot(2^4\cdot5)\\\Rightarrow3^{x+2}-1=2^4\cdot5\\\Rightarrow3^{x+2}-1=16\cdot5\\\Rightarrow3^{x+2}-1=80\\\Rightarrow3^{x+2}=80+1\\\Rightarrow3^{x+2}=81\\\Rightarrow3^{x+2}=3^4\\\Rightarrow x+2=4\\\Rightarrow x=4-2\\\Rightarrow x=2\\Vậy:x=2\)
\(\frac{5^4-5^3}{100}\)
\(\frac{3^3+3^2+3}{39}\)
\(\frac{5.3^7-5.3^5}{5.3^5-5.3^3}\)
\(\frac{2^{15}+2^{14}+2^{13}}{2^{13}+2^{12}+2^{11}}\)
đề bài yêu cầu là rút gọn các bạn nhớ giúp mình nha
5^4-3/100=1/20
3^3+2+1/3*13=3^5/13
5.3^7-5/5.3^5-3=1
2^15+14+13/2^13+12+11=2^6
tim x biet
X+35=-22-X
(6X-4^2) .7^8=2.7^9
5.3^x-1-7.3^12=8.3^12
3.(x-15)^3=-24
lx+18l=10
tìm x:
x. (-3)^5 = 5.3^4