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e: =>1/3(2x-5)=-2/3-3/2=-13/6
=>2x-5=-13/2
=>2x=-3/2
hay x=-3/4
f: =>2|1/2x-1/3|=1/4+3/2=1/4+6/4=7/4
=>|1/2x-1/3|=7/8
=>1/2x-1/3=7/8 hoặc 1/2x-1/3=-7/8
=>1/2x=29/24 hoặc 1/2x=-13/24
=>x=29/12 hoặc x=-13/12
c, Vì |4 - 1/2x| > 0
=> |4 - 1/2x| - 1/4 > -1/4
=> C > -1/4
Dấu "=" xảy ra
<=> |4 - 1/2x| = 0
<=> 4 - 1/2x = 0
<=> 1/2x = 4
<=> x = 8
KL: Cmin = -1/4 <=> x = 8
a) \(60\%x+\frac{2}{3}x=\frac{1}{3}.6\frac{1}{3}\)
=> \(\frac{3}{5}x+\frac{2}{3}x=\frac{19}{9}\)
=> \(\frac{19}{15}x=\frac{19}{9}\)
=> \(x=\frac{19}{9}:\frac{19}{15}\)
=> \(x=\frac{5}{3}\)
b) (-0,6x - 1/3) . 3/5 - (-1) = 1/3
=> (-3/5x - 1/3) .3/5 = 1/3 - 1
=> (-3/5x - 1/3).3/5 = -2/3
=> -3/5x - 1/3 = -2/3 : 3/5
=> -3/5x - 1/3 = -10/9
=> -3/5x = -10/9 + 1/3
=> -3/5x = -7/9
=> x = -7/9 : (-3/5)
=> x = 35/27
a,60%x+2/3x=1/3.6 1/3
x(60%+2/3)=19/6
x.19/15=19/6
x=19/6 : 19/15
x=5/2
b,[-0,6x-1/2].3/4-(-1)=1/3
(-3/5x-1/2).3/4=1/3-1
(-3/5x-1/2).3/4=-2/3
-0,6x-0,5=-2/3:3/4
................................
c,2[1/2x-1/3]-3/2=1/4
....................................... (tương tự...)
d,Số đó là:720% : 2/3=10,8
1. a, 2(x - 3) + 1 = -25
<=> 2(x - 3) = -26
<=> x - 3 = -13
<=> x = -10
b, 13x + 14 = 2x - 52
<=> 13x - 2x = -52 - 14
<=> 11x = -66
<=> x = -6
@Lê Thị Hồng Ngát
a) 2. |1/2-1/3| - 3/2 =1/4 b)3/4-2.|2x-3/2|=2
2.|1/2-1/3|=1/4+3/2 2|2x-3/2|=3/4-2
2.|1/2-1/3|=2/8+12/8 2|2x-3/2|=-5/4
2.|1/2x-1/3|=14/8 |2x-3/2|=-5/4:2
|1/2x-1/3|=14/8:2 |2x-3/2|=-5/8
1/2x-1/3=14/8.2/1 x-3/2=-5/8:2
1/2x-1/3=14/4 x-3/2=-5/16
x-1/3=14/4:1/2 x=-5/16+3/2
x-1/3=14/4.2 x=19/16
x-1/3=7 => x= 19/16 hoặc -19/16
x=7+1/3
x=21/3+1/3
x=22/3
=>x= 22/3 hoăc -22/3
c
g: =>2|2x-2/3|=-5/4
=>|2x-2/3|=-5/8(vô lý)
h: \(\Leftrightarrow\left(-\dfrac{3}{5}x-\dfrac{1}{2}\right)\cdot\dfrac{3}{4}=\dfrac{1}{3}-1=-\dfrac{2}{3}\)
\(\Leftrightarrow-\dfrac{3}{5}x-\dfrac{1}{2}=-\dfrac{2}{3}:\dfrac{3}{4}=\dfrac{-2}{3}\cdot\dfrac{4}{3}=\dfrac{-8}{9}\)
=>3/5x+1/2=8/9
=>3/5x=8/9-1/2=16/18-9/18=7/18
hay x=35/54