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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
\(\left(-0,6x-\frac{1}{2}\right).\frac{3}{4}-\left(-1\right)=\frac{1}{3}\)
\(\left(-0,6x-\frac{1}{2}\right).\frac{3}{4}+1=\frac{1}{3}\)
\(\left(-0,6x-\frac{1}{2}\right).\frac{3}{4}=\frac{1}{3}-1\)
\(\left(-0,6x-\frac{1}{2}\right).\frac{3}{4}=\frac{-2}{3}\)
\(-0,6x-\frac{1}{2}=-\frac{2}{3}:\frac{3}{4}\)
\(-0,6x=-\frac{8}{9}\)
\(x=\frac{-8}{9}:\left(-0,6\right)\)
\(x=\frac{40}{27}\)
j) (x + 2).(3 - x) = 0
TH1: x + 2 = 0
x = 0 - 2
x = (-2)
TH2: 3 - x = 0
x = 3 - 0
x = 3
⇒ Vậy x = (-2) hoặc x = 3.
m) (x + 5).(x.2 - 4) = 0
TH1: x + 5 = 0
x = 0 - 5
x = (-5)
TH2: x.2 - 4 = 0
x.2 = 0 + 4
x.2 = 4
x = 4 : 2
x = 2
⇒ Vậy x = (-5) hoặc x = 2.
g) 0,3x + 0,6x = 9
x.(0,3 + 0,6) = 9
x. 0,9 = 9
x = 9 : 0,9
x = 10
j) (x + 2)(3 - x) = 0
x + 2 = 0 hoặc 3 - x = 0
*) x + 2 = 0
x = 0 - 2
x = -2
*) 3 - x = 0
x = 3
Vậy x = -2; x = 3
m) (x + 5)(x.2 - 4) = 0
x + 5 = 0 hoặc x.2 - 4 = 0
*) x + 5 = 0
x = 0 - 5
x = -5
*) x.2 - 4 = 0
2x = 0 + 4
2x = 4
x = 4 : 2
x = 2
Vậy x = -5; x = 2
g) 0,3x + 0,6x = 9
0,9x = 9
x = 9 : 0,9
x = 10
\(\frac{3}{4}\times x+\frac{5}{3}\times x=\frac{7}{12}\)
\(\left(\frac{3}{4}+\frac{5}{3}\right)\times x=\frac{7}{12}\)
\(\frac{29}{12}\times x=\frac{7}{12}\)
\(x=\frac{7}{12}\div\frac{29}{12}\)
\(x=\frac{7}{29}\)
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
-0,6x - \(\frac{-3}{4}\)x + x - \(\frac{1}{4}\) = \(\frac{23}{4}\)
-0,6x - \(\frac{-3}{4}\)x + 1x - \(\frac{1}{4}\)= \(\frac{23}{4}\)
x . ( -0,6 - \(\frac{-3}{4}\)+ 1 - \(\frac{1}{4}\)) = \(\frac{23}{4}\)
x . \(\frac{9}{10}\) = \(\frac{23}{4}\)
x = \(\frac{23}{4}\): \(\frac{9}{10}\)
x = \(\frac{115}{18}\)
x.
ko phải là 23/4 mak là hồn số hai ba phần tư bn ơi