Ta có:
\(\frac{1}{4}+\frac{1}{3}:\left(2x-1\right)=-5\)
\(\frac{15}{60}+\frac{1}{3}:\left(2x-1\right)=-\frac{300}{60}\)
\(\Rightarrow\frac{20}{60}:\left(2x-1\right)=-\frac{300}{60}-\frac{15}{60}=-\frac{315}{60}\)
\(2x-1=-\frac{315}{60}.\frac{1}{3}=-\frac{315}{180}=-\frac{7}{4}\)
\(2x=-\frac{7}{4}+1=-\frac{7}{4}+\frac{4}{4}=-\frac{3}{4}\)
\(\Rightarrow x=\frac{-3}{4}:2=-\frac{3}{8}\)
B1: Tìm x:
1/ \(\dfrac{x+3}{15}\) = \(\dfrac{1}{3}\) - \(\dfrac{1}{15}\)
2/ (2x - 5) = (x - 3) = 0
3/ (3x - 4) - (2x - 5) = 3
4/ (2x + 1) x (\(\dfrac{1}{2}\)x - 1) = 0
tìm x biết:
(3x-1) [- 1/2x+5]=0
1/4+1/3:(2x-1)=-5
[2x+3/5]2 - 9/25=0
-5(x+1/5)-1/2(x-2/3)=3/2x - 5 /6
[x+1/2]x [2/3-2x]=0
17/2-|2x-3/4|=-7/4
2/3x-1/2x =5/12
(x+1/5)2+17/25=26/25
[x.44/7+3/7].11/5-3/7=-2
3[3x-1/2]+1/9=0
tìm x , biết :
a, (x-1/5).(x-1+3/5)<0
b,(x-4/7):(x+1/2)>0
c,(2x-3):(x+1+3/4)
d,|2x-1|+1=2x
Tìm x:
a) |x|-3/4=5/3
b) |2x-1/3|+5/6=1
c) 17/2-|2x-3/4|=-7/4
d) |2x-1|=(-4) mũ 2
Tìm x
a) 1/3x + 2/5( x - 1 ) = 0
b) (2x - 3 )(6 - 2x ) =0
c) 2|1/2x - 1/3 | - 3/2 = 1/4
d) 3/4 - 2 . | 2x - 2/3 | = 2
e) ( 3x - 1)(-1/2x + 5 ) = 0
g)-5(x + 1/5 ) - 1/2(x - 2/3 ) = 2/3x - 5/6
h) 3(x - 1/2 ) - 5(x + 3/5 ) = -3 + 1/5
i) 60%x + 2/3x = 1/3. 6và1/3 ( 6và1/3 là hỗn số )
Bài 1: tìm x
a) 2^2x.2^4=1024
b) 2.3^x=10.3^12+8.27^4
c) 5^8.25^x+1=5^17
d) 3^x-1+3^x-4=28.243
e) (2x-4)^5=(2x-4)^3
b) 40%X-4/5=2/3(x in đậm là số cần tìm) c) 2.5-1/4×(2-1/2X)=1/4(x in đậm là số cần tìm) d) X-3/-4=-9/X-3 e) 1/2X=3/4Y và X +Y=25
1. Tìm x biết:
a, (x-3)2x+4= 1
b, 3x-5= 2x-4
c, 1+2+3+......+x=45
d,3x. 3x+1=27
e, 3x-5=2x-4
2. Tìm x,y thuộc Z
a, x.y+6
b,(2x+1).(y-3)=10
Tìm x biết
a,3/1/2x -5=0
b,3×(x-2)+5/3/4=0
c,1/2x-3-2=0
d, 1/3x+1=2x-3/2
e,(x)-3=5/1/2
g,(x-5)(x+1/2)=0
H,(2x-1/2)=4
i,(4+x3)=8
Tìm x:
a, -1/3. (15x-9)+ 2/7. (-x-34)= 1- 3/4. (-16x+4)
b, -1/3. (x-5)+ 1/2. (2x-1/3) = -4.(x+1/2) -7
c, 3.(-2x+7) -6. (1/2x) =1.(x-3)
