Tìm X : 68,15 + (X : 8 + X x 5) = 98,9
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X − 17 = 8
X = 8 + 17
X = 25
X + 5 = 33
X = 33 − 5
X = 28
8 + x = 73
X = 73 − 8
X = 65
Ta thấy \(\left|x+\frac{1}{8}\right|\ge0\forall x;\left|x+\frac{2}{8}\right|\ge0\forall x;\left|x+\frac{5}{8}\right|\ge0\forall x\)
\(\Rightarrow\left|x+\frac{1}{8}\right|+\left|x+\frac{2}{8}\right|+\left|x+\frac{5}{8}\right|\ge0\)
\(\Rightarrow4x\ge0\Rightarrow x\ge0\)
\(\Rightarrow x+\frac{1}{8}+x+\frac{2}{8}+x+\frac{5}{8}=4x\)
\(\Rightarrow3x+1=4x\)
=> x = 1 (t/m)
Vậy x=1
a) \(\dfrac{3}{5}:x=3\)
\(x=\dfrac{3}{5}:3\)
\(x=\dfrac{3}{5}\times\dfrac{1}{3}\)
\(x=\dfrac{1}{5}\)
b) \(\dfrac{x}{5}:\dfrac{3}{8}=\dfrac{8}{5}\)
\(\dfrac{x}{5}=\dfrac{8}{5}\times\dfrac{3}{8}\)
\(\dfrac{x}{5}=\dfrac{3}{5}\)
\(=>x=3\)
a,2/5 = 2/5 ; 3/8=6/16 ; 1/9=3/27
b, 4/3=8/6 ; -1=-1 ; -4/-2=-8/4
tick cho mik nhé
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
68,15 + (\(x\) : 8 + \(x\) x 5) = 98,9
\(x\) : 8 + \(x\) x 5 = 98,8 - 68,15
\(x\) x 0,125 + \(x\) x 5 = 30,65
\(x\) x (0,125 + 5) = 30,65
\(x\) x 5,125 = 30,65
\(x\) = 30,65 : 5,125
\(x\) = 6
\(68,15+\left(x:8+x\times5\right)=98,9\)
\(\left(x:8+x\times5\right)=98,9-68,15\)
\(\left(x:8+x\times5\right)=30,75\)
\(x:8+x\times5=30,75\)
\(x\times0,125+x\times5=30,75\)
\(x\times\left(0,125+5\right)=30,75\)
\(x\times5,125=30,75\)
\(x=30,75:5,125\)
\(x=6\)