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1: x=3/4-1/2=3/4-2/4=1/4
2: x-1/5=2/11
=>x=2/11+1/5=21/55
3: x-5/6=16/42-8/56
=>x-5/6=8/21-4/28=5/21
=>x=5/21+5/6=15/14
4: x/5=5/6-19/30
=>x/5=25/30-19/30=6/30=1/5
=>x=1
5: =>|x|=1/3+1/4=7/12
=>x=7/12 hoặc x=-7/12
6: x=-1/2+3/4
=>x=3/4-1/2=1/4
11: x-(-6/12)=9/48
=>x+1/2=3/16
=>x=3/16-1/2=-5/16
1)x= 1/4
2)x= 2/11+ 1/5
x= 21/55
3)x - 5/6 = 5/21
x = 5/21+5/6
x = 15/14
4)x/5 = 5/6 + -19/30
x:5 = 1/5
x = 1/5.5
x = 1
5) |x| - 1/4 = 6/18
|x| = 6/18 - 1/4
|x| =7/12
⇒x= 7/12 hoặc -7/12
6)x = -1/2 +3/4
x= 1/4
7) x/15 = 3/5 + -2/3
x:15 = -1/15
x = -1/15. 15
x = -1
8)11/8 + 13/6 = 85/x
85/24 = 85/x
⇒ x = 24
9) x - 7/8 = 13/12
x = 13/12 + 7/8
x = 47/24
10)x - -6/15 = 4/27
x = 4/27 + (-6/15)
x = -34/135
11) -(-6/12)+x = 9/48
x= 9/48 - 6/12
x = -5/16
12) x - 4/6 = 5/25 + -7/15
x -4/6 = -4/15
x = -4/15 + 4/6
x = 2/5
a)
\(\frac{x}{18}=\frac{y}{15},x-y=-30\)
\(\frac{x}{18}=\frac{y}{15}\)
\(\frac{x}{18}-\frac{y}{15}=0\)
\(-\frac{6y-5x}{90}=0\)
\(6y-5x=0\)
\(x-y=-30\)
\(-\left(y-x-30\right)=0\)
\(y-x-30=0\)
\(\Rightarrow x=-180;y=-150\)
b: \(\left[\left(6+\dfrac{3}{5}-3-\dfrac{3}{14}\right)\cdot\dfrac{2}{5}\right]:\left(21-1.25\right)=x:\left(5+\dfrac{5}{6}\right)\)
\(\Leftrightarrow x:\dfrac{35}{6}=\dfrac{237}{175}:\dfrac{79}{4}\)
\(\Leftrightarrow x:\dfrac{35}{6}=\dfrac{12}{175}\)
\(\Leftrightarrow x=\dfrac{2}{5}\)
a, ( 152 +và 2/4 - 148 và 3/8 ) : 0,2 = x : 0,3
=> 33/8 : 1/5 = x : 3/10
=> x : 3/10 = 165/8
=> x = 99/10
b, ( 85 và 7/30 - 83 và 5/18 ) : 2 và 2/3 = 0,01x : 4
=> 88/45 : 8/3 = 0,01x : 4
=> 0,01x : 4 = 11/15
=> 0,01x = 44/15
=> x = 880/3
c, x - 1/ x + 5 = 6/7
=> 7( x - 1 ) = 6( x + 5 )
=> 7x - 7 = 6x + 30
=> 7x - 6x = 7 + 30
=> x = 37
d, x2/6 = 24/25
=> x2. 25 = 6 . 24
=> x2.25 = 144
=> x2 = 144/25
=> x = ( 12/5)2 hoặc x = ( -12/5)
g, x - 3/ x + 5 = 5/7
=> 7( x - 3 ) = 5 ( x + 5 )
=> 7x - 21 = 5x + 25
=> 7x - 5x = 21 + 25
=> 2x = 46
=> x = 23
1) = \(\frac{3}{5}\)
2) =\(\frac{6}{7}\)
3)\(\frac{9}{13}\)
4)\(\frac{4}{13}\)
\(\frac{5}{6} + \left [ \frac{2}{3}x - \left ( \frac{-7}{12} \right ) \right ]= \frac{1}{2}\)
\(\frac{2}{3}x + \frac{7}{12}= -\frac{1}{3}\)
\(\frac{2}{3}x = - \frac{1}{3} - \frac{7}{12}\)
\(\frac{2}{3}x= -\frac{11}{12}\)
\(x= - \frac{11}{8}\)
Vậy \(x= - \frac{11}{8}\)
b) \(\frac{x}{15} + 1,2= \frac{1}{3}\)
\(\frac{x}{15}= \frac{1}{3} - 1,2\)
\(\frac{x}{15}=- \frac{13}{15}\)
x = - 13
Vậy x = - 13
câu c pn coi lại đề nhé
d) 3 + \(\left | x - 1,34 \right |\) = 5
\(\left | x - 1,34 \right |\) = 5 - 3
\(\left | x - 1,34 \right |\) = 2
\(\Leftrightarrow \begin{bmatrix} x - 1,34 = 2 & & \\ x - 1,34= 2 & & \end{bmatrix}\) \(\Leftrightarrow \begin{bmatrix} x= 3,34 & & \\ x = - 0,66 & & \end{bmatrix}\)
(bỏ dấu ngoặc bên phải nha pn)
Vậy x = 3,34; x = - 0,66
câu e pn lm tương tự
ôi ôi bạn ơi
\(\frac{5}{7}\)x18x\(\frac{1}{3}\)-\(\frac{5}{7}\)x 30 x\(\frac{1}{3}\)
=\(\frac{90}{7}\)x\(\frac{1}{3}\)-\(\frac{5}{7}\)x 30 x\(\frac{1}{3}\)
=\(\frac{30}{7}\)-\(\frac{5}{7}\)x 30 x\(\frac{1}{3}\)
=\(\frac{30}{7}\)-\(\frac{150}{7}\)x\(\frac{1}{3}\)
=\(\frac{30}{7}\)-\(\frac{50}{7}\)
=\(\frac{-20}{7}\)
Hok tốt!
@Kaito Kid