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1)=>3(x-5)(2x+9)+3(x-5)=0=>(x-5)(6x+30)
=>x-5=0=>x=5
6x+30=0=>x=-5
2)=>x^2-16=0=>x=+-4
12-4x=0=>x=3
3)=>9-x^2=0=>x=+-3
4x-8=0=>x=2
4)=>8-x^3=0=>x=3
5^x-125=0=>x=2
5)=>2^x.2^x=8=>2^2x=8=>2x=3=>x=1,5
a) 22.23.x=82
22.23.x= 26
25.x = 26
x = 26:25
x = 2
b) 5x-1.52= 252
5x-1.52 = 54
5x-1 = 54: 52
5x-1 = 52
=> x-1=2
x = 2+1
x = 3
c)(2x-1)3=125
(2x-1)3= 53
=> 2x-1=5
2x = 5+1
2x = 6
x = 6:2
x = 3
d) 8x.2x=44
(8.2)x= 44
16x = 44
16x = 256
16x = 162
=> x=2
e) (x2.53)2 = 56
x2.2. 53.2= 56
x4 . 56 = 56
x4 = 56:56
x4 = 50
x4 =1
=> x=1
1) 3^4.2+2^3.5-7(5^7:5^5)
=3^4.2+2^3.5-7.5^2
=81.2+8.5-7.25
=162+40-175
=202-175=27
2) 5.2^2.2^3-4(5^8:5^6)
=5.4.8-3.5^2
=160-100=60
3) (3^5.3^7):3^10+5.2^4-7^3:7
=3^12:3^10+5.16-7^2
=3^2+80-7^2
=9+80-49=40
4) 15:(3^5:3^4)-2^9:2^7
=15:3-2^2
=5-4=1
5) 5.3^5:(3^8:3^5)-2^3.5
=5.3^5:3^3-8.5
=5.3^2-40
=5.9-40
=45-40=5
a. \(8^{x-3}.8^3=2^5.4^5\)
\(\Rightarrow8^{x-3+3}=32.1024\)
\(\Rightarrow8^{x-3+3}=32768\)
\(\Rightarrow8^{x-3+3}=8^5\)
\(\Rightarrow x-3+3=5\)
\(\Rightarrow x=5+3-3\)
\(\Rightarrow x=5\)
Vậy...
b. \(5^{3.x-2}.125=5^4\)
\(\Rightarrow5^{3x-2}.5^3=5^4\)
\(\Rightarrow5^{3x-2}=5^4:5^3=5^1\)
\(\Rightarrow3x-2=1\)
\(\Rightarrow3x=1+2=3\)
\(\Rightarrow x=3:3=1\)
Vậy...
8x-3.83=25.45
(23)x-3.(23)3=25.(22)5
23(x-3).29=25.210
23x-3.3.29=215
23x-9=215:29
23x-9=24
=>3x-9=4
3x=4+9
3x=15
x=15:3
x=5