5^(2x-3) = 5^2.3 + 2.5^2
5^(2x-3) = 5^2( 3 + 2)
5^(2x-3) = 5^2.5
5^(2x-3) = 5^3
2x - 3 =3
2x = 6
x = 3
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5^(2x-3) = 5^2.3 + 2.5^2
5^(2x-3) = 5^2( 3 + 2)
5^(2x-3) = 5^2.5
5^(2x-3) = 5^3
2x - 3 =3
2x = 6
x = 3
tim x,biet:
5x=125 32x=81 52x-3 -2.52=52.3
Tim x:
3^2x-4 -x^0 = 8
65- 4^x+2 = 2014^0
120+2. ( 3x + 17) = 214
5^2x-3 - 2.5^2 = 5^2 = 5^2.3
30- [4(x-2)+15] =3
740:(x+10)= 10^2 - 2.13
[(6x-39):7].4= 12
*
a)Chung minh: (54+55-2.54)chia het cho 20
b)tim x;y thuoc N,biet: (x-3)(2x-5)=7
5^2x-3-2.5^2=5^2.3
a)5^x+1=125
b)5^2x-3-2.5^2=5^2.3
c)4^x.3=16
\(5^{2x-3}-2.5^2=5^2.3\)
Tìm số tự nhiên x , biết
tìm x :
a |x-5|+2x+3=11 b x-7+|3-x|=10. c 5^2x-3-2.5^2=5^2.3
A=3^x+3^x+1
B=5^x+5^X+2
C=5^2x-3-2.5^2=5^2.3
D=3^x+2+3^x=810
52x-3-2.52=52.3