a.
\(3^{x+1}=9^x\)
\(3^{x+1}=\left(3^2\right)^x\)
\(3^{x+1}=3^{2x}\)
\(x+1=2x\)
\(2x-x=1\)
\(x=1\)
c.
\(3^{2x-1}=243\)
\(3^{2x-1}=3^5\)
\(2x-1=5\)
\(2x=5+1\)
\(2x=6\)
\(x=\frac{6}{2}\)
\(x=3\)
Chúc bạn học tốt
1,
a, \(|x-1,5|+|2,5-x=0|\)
b, \(\left(x-\dfrac{1}{2}\right)^2=0\)
c, \(\left(x-2\right)^2=1\)
d, \(\left(2x-1\right)^3=-8\)
2,
a, \(3^{x+1}=9^x\)
b,\(2^{3x+2}=4^{x+5}\)
c, \(3^{2x-1}=243\)
1, Tìm x biết
a, ( 4/5 )^2x+5 = 625/256
b, ( 3x - 4 )^4 = ( 3x - 4 )^2
c, 3^x+1 = 9^x
d, 2^2x+3 = 4^x-5
Tìm x,biết:
a)(3x-1).(2x+7)-(x+1).(6x- 5)=16
b)(10x+9).x-(5x-1).(2x+3)=8
c)(3x- 5).(7- 5x)+(5x+2).(3x-2)-2=0
9 Tìm x biết:
a) (2x-3)2=16 ; b) (3x-2)5=-243 ; c) (2x-5)2000+(3y+4)2002\(\le\)0
Tìm x, biết:
a, 1/4 + 1/3 : 2x = -5
b, ( 3x - 1/4 ) . ( x + 1/2 ) = 0
c, ( 2x - 5 ) . ( 3/2x + 9 ) . ( 0,3x - 12 ) = 0
Tìm nghiệm của các đa thức sau
A (x)=3-5x; B(x)=(x-1)(x+5) C(x)= 2x2-3x;
G (x)= x2-5x+4 H(x)=-3x2(x-1)-9(1-x)
tìm x
a, 31-2/x+23=9/4
b, |2x-1|/1\2=18/5
c,x-2/x-1=x+4/x+7
h, 3x+2/5x+7=3x-1/5x-3
Tìm x: a) 8< 2^x < 2^9 * 2^-5
b) 27 < 81^3 / 3^x < 243
c) (2/5)^x > (5\2)^-3*(-2\5)^2
d) (-3/4)^3x-1 = 256/81Tìm x: a) 8< 2^x < 2^9 * 2^-5
b) 27 < 81^3 / 3^x < 243
c) (2/5)^x > (5\2)^-3*(-2\5)^2
d) (-3/4)^3x-1 = 256/81