tìm soos nguyên x nếu biết
1/ 5.3\(^x\)= 5.3\(^4\)
2/ 9.5\(^x\)= 6.5\(^6\)+3.5\(^6\)
3 /2.3\(^{x+2}\)+ 4.3\(^{x+1}\)=10.3\(^6\)
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 x,biết
A) (-3)^2x=9^5
B) 9.5^ x-3=6.5^6+3.5^6
C) 5^x+4-3.5^x+3=5^11.2
D) 3^x+2+4.3^x+1=7.3^6
E) 5^x+3=10^5.6^3:4^4.3^3
tìm x
câu 1 : 5^x+4-3.5^x+3=2.5^11
câu 2 : 2.3^x+2+4.3^x+1=10.3^6
câu 3 :6.8^x-1+8^x+1=6.8^19+8^2
giúp tớ nha . Cảm ơn
Tìm số ự nhiên x biết.
a, 2x=46.163
b, 2x=\(\frac{47}{83}\)
c, \(\frac{2^{x-3}}{4^{10}}\)=83
d,5.3x=54
e, 9.5x=6.56+3.56
Tìm số ự nhiên x biết.
a, 2x=46.163
2x=(22)2.(24)3
2x=24.212
2x=216
=>x=16
Vậy x=16
học tốt
a, \(2^x=4^6\cdot16^3\)
\(2^x=\left(2^2\right)^6\cdot\left(2^4\right)^3\)
\(2^x=2^{12}\cdot2^{12}\)
\(2^x=2^{24}\)
\(\Rightarrow\text{ }x=24\)
\(b,\text{ }\frac{2^{x-3}}{4^{10}}=8^3\)
\(\Rightarrow\text{ }\frac{2^{x-3}}{\left(2^2\right)^{10}}=\left(2^3\right)^3\)
\(\frac{2^{x-3}}{2^{20}}=2^9\)
\(\Rightarrow\text{ }2^{x-3}=2^{20}\cdot2^9\)
\(2^{x-3}=2^{29}\)
\(\Rightarrow\text{ }x-3=29\)
\(x=29+3\)
\(x=32\)
2Tìm X:
a.(19x+2.5^2):14=(13-8)^2-4^2
b.2.3^x=10.3^12+8.27^4
c.{x^2-[6^2-(8^2-9.7)^3-7.5]^3-5.3}^3=1
d.60-3(x-2)=51
e.4x-20=2^5:2^2
{ x2 - [ 62 - ( 82 - 9.7)3 - 7.5]3 - 5.3 }3 = 1
{ x2 + [ 36 - (64 - 63)3 - 35]3 - 15}3 = 1
[ x2 - ( 36 - 13 - 35 ) - 15 ]3 = 1
[ x2 - ( 36 - 1 - 35 ) - 15]3 = 1
[ x2 - ( 35 - 35 ) - 15]3 = 1
[ x2 - 0 - 15]3 = 1
( x2 - 15 )3 = 1
<=> ( x2 - 15)3 = 13
=> x2 - 15 = 1
<=> x2 = 16
=> x = 4
Tìm x
a.(2x - 3)^2 =16
b.2.3^ x +2 + 4.3^ x+1 = 10.3^6
a) (2x - 3)2 = 16
=> (2x - 3)2 = 42
=> \(\orbr{\begin{cases}2x-3=4\\2x-3=-4\end{cases}}\)
=> \(\orbr{\begin{cases}2x=7\\2x=-1\end{cases}}\)
=> \(\orbr{\begin{cases}x=\frac{7}{2}\\x=-\frac{1}{2}\end{cases}}\)
Vậy ...
b) 2.3x + 2 + 4. 3x + 1 = 10.36
=> 2.3x + 1. 3 + 4.3x + 1 = 10 . 36
=> 6.3x + 1 + 4.3x + 1 = 10.36
=> (6 + 4).3x + 1= 10.36
=> 10.3x + 1= 10.36
=> 3x + 1= 36
=> x + 1 = 6
=> x = 6 - 1
=> x = 5
\(a,\left(2x-3\right)^2=16\)
\(\Rightarrow\left(2x-3\right)^2=4^2\)
\(\Rightarrow2x-3=4\)
\(2x=4+3\)
\(2x=7\)
\(x=7:2\)
\(x=\frac{7}{2}\)
Tìm x
a.(2x - 3)2 =16
=> 2x - 3 = \(\pm4\)
2x-3 = 4 2x - 3 = -4
=> x = \(\frac{3}{2}\) => x = \(-\frac{1}{2}\)
2^2.4^4.2^6.2.2=
2.2^3.2^7.2^4=
3^2.3=
3^4.3^3.3=
3.3^5.3^4.3^2=
3.3^6.3^7.3^4=
4.4^3=
4^5.4.4^7=
4.4^3.4^5.4^6=
5.5^6
5.5^4=
5.5^2.5^4=
5.5^3.5^4.5^6=
5.5^6.5^4.5^3=
x.x^2
x.x^3.x^5=
a.a^4
a.a^2.a^4.a^5.a^7=
a.a^3.a^5.a^6
a^4.a.a^5.a^6.a=
x.x^3.x^4=
x^5.x^4.x.x^7.x^6=
7.7^2=
7.7^2.7^4.7^5=
7^3.7^5.7.7^4=
7^2.7.7^6.7^6.7^3=
10.10^2=
10.10^2=
10.100.10^3=
10.100.10^4.1000=
10^2.10^4.100.1000=
làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người
Bài làm
22.44.26.2.2=22.28.26.22=218
2.23.27.24=215
32.3=33=27
34.33.3=38
3.35.34.32=312
3.36.37.34=318
4.43=44
45.4.47=413
4.43.45.46=415
5.56=57
5.54=55
5.52.54=57
5.53.54.56=514
5.56.54.53=514
x.x2=x3
x.x3.x5=x9
a.a4=a5
a.a2.a4.a5.a7=a19
a.a3.a5.a6=a15
a.a4.a.a5.a6.a=a18
x.x3.x4=x8
x5.x4.x.x7.x6=x23
7.72=73
7.72.74.75=712
73.75.74.7=713
72.7.76.76.73=718
10.102=103
10.100.103=106
10.100.104.1000=1010
102.104.100.1000=1011
Tk nha !
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) \(5.3^x=7.3^5-2.3^5\Leftrightarrow5.3^x=3^5.\left(7-2\right)\)
\(\Leftrightarrow3^5.x=3^5.5;x=5\)
1, 5.3\(^x\)=5.3\(^4\) 2, 7.4\(^x\)=7.4\(^3\) 3, 8.7\(^x\)=8.7\(^6\)
4, 2\(^x\)=2.2\(^8\) 5, 6.8\(^{x-1}\)+8\(^{x+1}\)=6.8\(^{19}\)+8\(^{21}\) 6, 4.3\(^{x-2}\)+2.3\(^{x+1}\)=4.3\(^4\)+2.3\(^7\)
7,(3x-4)\(^6\)=(3x-4)\(^2\) (\(\dfrac{1}{2}\)-\(\dfrac{1}{6}\)):3\(^x\)+3\(^{x+2}\)=3\(^{16}\)+3\(^{13}\)
1: \(5\cdot3^x=5\cdot3^4\)
nên \(3^x=3^4\)
hay x=4
2: \(7\cdot4^x=7\cdot4^3\)
nên \(4^x=4^3\)
hay x=3
3: \(8\cdot7^x=8\cdot7^6\)
nên \(7^x=7^6\)
hay x=6
: 5⋅3mũx=5⋅34
nên 3x=34
vậy x=4
2: 7⋅4x=7⋅43
nên 4x=43
vậy x=3
3: 8⋅7x=8⋅7mũ6⋅
nên 7x=76