\(2^{x+4}-2^x=480\)
\(\Rightarrow2^x\cdot2^4-2^x=480\)
\(\Rightarrow2^x\left(2^4-1\right)=480\)
\(\Rightarrow2^x\cdot15=480\)
\(\Rightarrow2^x=32\)
\(\Rightarrow2^x=2^5\Rightarrow x=5\)
Cho hai đa thức P( x ) = x mũ 2 cộng 5 x mũ 4 trừ 3 x mũ 3 cộng x mũ 2 cộng 4 x mũ 4 + 3 x mũ 3 - x + 5
Q(x) = x - 5 x mũ 3 trừ x mũ 2 trừ x mũ 4 + 4 x mũ 3 trừ x mũ 2 + 3 x - 1
Tìm x.
\(1,\dfrac{3}{2}\left(x-\dfrac{1}{3}\right)-\dfrac{1}{2}\left(x+\dfrac{1}{2}\right)=\dfrac{1}{4}\)
\(2,3\left(x-2\right)-4\left(x+2\right)=x+2\)
\(3,4x\left(x-1\right)+4x-2\left(x+1\right)=-2\)
\(4,x\left(x+2\right)-3\left(x-1\right)=3\left(x+1\right)\)
\(\dfrac{2}{(x + 2)(x + 4)}+\dfrac{4}{(x + 4)(x + 8)}+\dfrac{6}{(x + 8)(x + 14)}=\dfrac{x}{(x + 2)(x + 14)}\)
(X^2 +3x-4)^2 +3(x^2+3x-4)=x-4
Tìm x biết:
a, 2^x -15= 2^4+1
b, x+1/65+x+2/64=x+3/63+x+4/61
Tìm x biết:
a, 2^x -15= 2^4+1
b, x+1/65+x+2/64=x+3/63+x+4/61
viết biểu thức sau dưới dạng tích : a, ( x+y+x)^2 - 2(x+y+x)(y+z) + (y+z)^2
b,(x+y+x)^2 - (y+z)^2
c,(x+3)^2+4(x+3)+4
d, 25+10(x+1)+(x+1)^2
e,(x+2)^2+2(x+2)(x-2)+(x-2)^2
f,(x-3)^2 - 2(x^2-9)+(x+3)^2
a, tìm x biết: | x-1| + | x+3| = 4
b, tìm x biết: | x2 + | 6x - 2| | = x2 + 4
c, tìm x biết: |2x +3| - 2| 4 - x| = 5
a) 2 mũ 3 : |x-2| =2
b) | 2x + 1 | + | 5x -1 | + 7 mũ 4 = 49
c) | x mũ 3 ( x - 4 )= 5x mũ 2
d) | 2x - 5 | = 2 - x
e) x - | x + 1 | = 4
f) 3x + | 4x + 3 | = 5