\(\dfrac{x-3}{5}=\dfrac{2x+1}{4}\)
⇔ \(\left(x-3\right).4=\left(2x+1\right).5\)
\(4x-12=10x+5\)
\(4x-10x=5+12\)
\(-6x=17\)
\(x=\dfrac{-17}{6}\)
\(\dfrac{x-3}{5}=\dfrac{2x+1}{4}\)
⇔ \(\left(x-3\right).4=\left(2x+1\right).5\)
\(4x-12=10x+5\)
\(4x-10x=5+12\)
\(-6x=17\)
\(x=\dfrac{-17}{6}\)
c)5^x+1-5^x=20 c)2^x+2^x+4=544 c)4^2x+1+4^2x=80 c)3^2x+2+3^2x+1=108 c)7^x+3-7^x+1=16464
Bài 1.Tìm x biết
a, 4|3x - 1| + |x| - 2|x-5| + 7|x-3| = 12 b, 3|x + 4| - |2x + 1| - 5|x + 3| + |x - 9| = 5
c, |x + 5| - |1 - 2x| = x d, |x| - |2x + 3| = x - 1
e, |x| + |1 - x| = x + |x-3| g, |x-2| + |x-5| = 3
f, |2x - 1| + |2x - 5| = 4 m, |x-3| + |x + 5| = 8
n, |x-3| + |3x + 4| = |2x + 1|
Các bạn giúp mình nhanh với ạ mình đang cần gấp
Bài 2 Tìm x biết :
a) -5 | x - 3 | + | 1/2x + 4 | = 7|
b) | 2x + 1 | - 4 | 5 - x | = 9
c) | 9 - | x | = 8
d) - | 2x + 4/3 | - 11 - x | = -7/3
Cho hai đơn thức sau :
P(x)=5x^5+3x-4x^4-2x^3+6+4x²
Q(x)=2x^4-x+3x²-2x^3+1/4-x^5
Tính:1/3 P(x)-3/4 Q(x)
Tìm x,biết:
1) |x+2| + |x-5| = 7
2) |x-7| + 2x+5 =6
3) |2x + 1| +|x+3| = 4x
4) |x2 -2x| = x
5) |2x+3| = x+2
6) |5x-4 |= |x+2|
7) |x-2| - |2x - 3| - x = 2
cho 2 đa thức:
g(x) \(=-5x^4-x^5+2x^{^{ }2}-2x^3-\frac{1}{4}\)
h(x) \(=-x^5-2x^3-3x^4+1\frac{3}{4}x-2x^4\)
a) tính g(x)-h(x)
b) tìm 1 nghiệm của đa thức g(x)-h(x)
tìm x
a, | 5/4x - 7/2 | - | 5/8x + 3/5 | = 0
b, 21/5 + 3 : | x/4 - 2/3 | = 6
c,| 9 + x | = 2x
d, | 2x - 3 | + x = 21
e, | 7 - 2x | + 7 = 2x
f, | -x + 2/5 | + 1/2 = 3,5
G, | 3x - 4 | + 4 = 3x
|x-3| + |y-2x | =0
|x| + 3|2x -x ² | =0
|5x ² -5 | + 4|y-7 | =0
||x +1 | + |y-5 |=0
|x ² -1| + |y-1| =0
|x-1 | +|x ²-x |=0
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
Tìm x, biết rằng:
1) ( 2x + 1)3 = -0,001
2) ( 2x -3 )4 = ( 2x-3 )6
3) ( 2x+1 )5 = ( 2x+1)2010
4) \(\dfrac{8}{25}=\dfrac{2^x}{5^{x-1}}\)
5) 9x : 3x = 3
6) \(3^x+3^{x+3}=756\)
7) \(5^{x+1}+6.5^{x+1}=875\)
8) \(2^{x-1}.3^{y+1}=12^{x+9}\)
9) \(3^x=9^{y-1}\)
10) \(2^{x+1}.5^y=20^x\)
11) 15x : 3y = 75y
12) \(\dfrac{3}{5}:\dfrac{2x}{15}=\dfrac{1}{2}:\dfrac{4}{5}\)
13) \(\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{4}\) và xy + yz + zx = 104