Nhận xét : \(VT\ge0\)
\(\Rightarrow VT=2.\left(x+2\right)+2.\left(x-1\right)=2.\left(x+2+x-1\right)=2.\left(2x+1\right)=5\)
\(\Leftrightarrow2x+1=\frac{5}{2}\)
\(\Leftrightarrow2x=\frac{5}{2}-1\)
\(\Leftrightarrow2x=\frac{3}{2}\)
\(\Leftrightarrow x=\frac{3}{4}\)
Vậy : \(x=\frac{3}{4}\)
TÌM X, BIẾT:
a) 3 . ( 1/2 - x ) + 1/3 = 7/6 - x
b) 4 . ( 1/2 - x ) - 5 . ( x - 3/10 ) = 7/4
c) -3/2 . ( 4/5 - 2/3 ) + x = 4 . ( x - 1/2 )
d) 2 . ( 3/2 - x ) - 1/3 = 7x - 1/4
e) 1/5 . ( -3/5 -10 ) + 5x = x - 2/3
f) -3/2 . ( 5 - 1/6 ) + 4 . ( x - 1/2 ) = 1
~ PLEASE HELP ME ~
Tìm x
X-1/5 = 2x+1/3
X+3/2x-5 = 2/3
2/3 . 3x+1 - 7 . 3x = -405
2x+3 . 5 + 2x+2 . 3 + 2x+1 . 24 = 200
tìm x biết
a) \(\dfrac{1}{2}x+2\dfrac{1}{2}=3\dfrac{1}{2}x-\dfrac{3}{4}\)
b) \(\dfrac{2}{3}x-\dfrac{2}{5}=\dfrac{1}{2}x-\dfrac{1}{3}\)
c) \(\dfrac{1}{3}x+\dfrac{2}{5}\left(x+1\right)=0\)
d) \(\dfrac{2}{3}-\dfrac{1}{3}\left(x-\dfrac{3}{2}\right)-\dfrac{1}{2}\left(2x+1\right)=5\)
e) \(\dfrac{x+2015}{5}+\dfrac{x+2016}{4}=\dfrac{x+2017}{3}+\dfrac{x+2018}{2}\)
1. tìm x biết
a, (2x - 3)\(^2\) = |3 - 2x|
b, (x - 1)\(^2\) + (2x - 1)\(^2\) = 0
c, 5 - x\(^2\) = 1
d, x - 2\(\sqrt{x}\) = 0
g, (x - 1) + \(\dfrac{1}{7}\) = 0
3/2 . x + 3/7 = -4/5
-11/12 . x + 0.25 =5/6
(x - 2)2 =1
(2x - 1)3 = -8
Tìm x
A) 2x(x-5)-x(2x+3)=25
B) (3y^2-y+1)(y-1)+y^2(4-3y)=5/2
C) 2x^2 +3( x-1)( x+1)= 5x(×+1)
a) 11/12-(2/5+x)=2/3 b) 2x.(x-1/7)=0 c) 3/4+1/4:x=-2/5
( x /5 + 2/3 ) : 5/2 = x - 1
Thu gọn các đơn thức đồng dạng trong đa thức sau:
a) \(A=x^5-\dfrac{1}{2}x+7x^3-2x+\dfrac{1}{5}x^3+3x^4-x^5+\dfrac{2}{5}x^4+15\)
b) \(B=3x^2-10+\dfrac{2}{5}x^3+7x-x^2+8+7x^2\)
c) \(C=\dfrac{1}{7}x-2x^4+5x+6\)
1. Tìm x, biết :
a) 27x : 3x = 9
b) 25 : 5x = 5
c) 2 : (x + 2)2 = \(\dfrac{1}{18}\)
d) (5x - 1)2 = \(\dfrac{36}{49}\)
e) \(\left(\dfrac{3}{4}\right)^x=\dfrac{2^8}{3^4}\)
g) \(\left(\dfrac{-2}{5}\right)^x=\dfrac{16}{625}\)
h) 5(x-2)(x+3)=(-17)0
i) (x - 2)8=(x - 2)6
k) (x + 1)7=(x + 1)5
l) (3x - 1)2n+1=82n+1
