\(2^x+2^{x+1}+2^{x+2}+2^{x+3}-480=0\)
\(\Rightarrow2^x+2^{x+1}+2^{x+2}+2^{x+3}=480\)
\(\Rightarrow2^x.1+2^x.2+2^x.2^2+2^x.2^3=480\)
\(\Rightarrow2^x\left(1+2+2^2+2^3\right)=480\)
\(\Rightarrow2^x.15=480\)
\(\Rightarrow2^x=480\div15\)
\(\Rightarrow2^x=32=2^5\)
Vậy x = 5
Bài2:Tìm x biết
a.1/3+2/3:x=-7
b.1/3x+2/5(x-1)=0
c.(2x-3)(6-2x)=0
d.x:3/4+1/4=-2/3
e.-2/3-1/3(2x-5)=3/2
f.2 l1/2x-1/3l-3/2=1/4
g.3/4-2.l2x-2/3l=2
h.(-0,6x-1/2).3/4-(-1)=1/3
i.(3x-1)(-1/2x+5)=0
j.1/4+1/3:(2x-1)=-5
k.(2x+3/5)2-9/25=0
l.3(3x-1/2)3+1/9=0
m.-5(x+1/5)-1/2(x-2/3)=3/2x-5/6
n.3(x-1/2)-5(x+3/5)=-x+1/5
Tìm x biết 2*(x-1) +(-2)^3*(x-2)=(-2017)^0*(-2)^3*(x+3)
b) -(2x=1)-[(-3)^2-1]*(2x=1)=3-2*(1-2x)+7*(-4)
tìm x
a.2|1/2x-1/3|-3/2=1/4
b.3/4-2.|2x-2/3|=2
c.(2x-3)(6-2x)=0
tìm x biết
a) 2x-3/3+-3/2=5-3x/6-1/2
b)(3x-1/2) . (3-1/2x).(1+3/4:x)= 0
2x +35 = x -27
2x - 41 = 3x = (-23)
4(x-3) - 3(x+5) = 45. (-2) -34
(x+3).(2x-18) = 0
Tìm số nguyên x:
a) 103 - 57:[-2.(2x-1)2 – (-9)0]= -106
b) -2x + 3.{12 - 2[3x - (20 + 2x) - 4x] + 1}= 45
Tìm X:
a) 1/3 X + 2/5 (X - 1)=0
b) 1/2|X|+1/2=5/2
c) -2/3-1/3(2X-5)=3/2
d) (3X-1)(1/2X+5)=0
đ) 3 và 1/3+5/6X=3 và 1/2
Tìm x, y biết:
a) (-12) . (x - 14) + 7 . (3 - x) = 12.15
b) (2x - 8) . ( y - 2) = 0
c) x^2 - 75 = (-50)
d) (2x - 5)^2 - 1 = 0
e) (3y + 6)^3 + 27 = 0
c.(2x-3)(6-2x)=0
d.x:3/4+1/4=-2/3
tìm x biết
a ) x^2 - 2x+3 chia het cho x-1
b) 2x-3 + ( y-1)\(^2\) + ( 27-1 )\(^2\) \(\le\) 0
