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a ) 10 x X - 1 - 3 - 5 - 7 - ... - 19 = 2 + 4 + 6 + ... + 20
10 x X - 1 - 3 - 5 - 7 - ... - 19 = 110
10 x X - ( 1 + 3 + 5 + 7 + ... + 19 ) = 110
10 x X - 100 = 110
10 x X = 110 + 100
10 x X = 210
X = 210 : 10
X = 21
\(\frac{1}{2}\times\left(3x+1\right)-2:3=4\)
\(\frac{1}{2}\times\left(3x+1\right)-\frac{2}{3}=4\)
\(\frac{1}{2}\times\left(3x+1\right)-\frac{1}{2}\times\frac{4}{3}=4\)
\(\frac{1}{2}\times\left(3x+1-\frac{4}{3}\right)=4\)
\(3x+\frac{-1}{3}=4:\frac{1}{2}\)
\(3x+\frac{-1}{3}=8\)
\(3x=\frac{24}{3}-\left(\frac{-1}{3}\right)\)
\(3x=\frac{25}{3}\)
\(x=\frac{25}{3}:3\)
\(x=\frac{25}{9}\)
\(\frac{1}{17}+\frac{1}{2}=3x-\frac{3}{2}\)
\(\frac{2}{34}+\frac{17}{34}=3x-\frac{3}{2}\)
\(\frac{19}{34}=3x-\frac{3}{2}\)
\(3x=\frac{19}{34}+\frac{3}{2}=\frac{19}{34}+\frac{51}{34}\)
\(3x=\frac{70}{34}\)
\(\Rightarrow x=\frac{70}{34}\div3=\frac{70}{34\cdot3}=\frac{35}{51}\)
\(\Rightarrow x=-\frac{16}{17}\div3=-\frac{16}{51}\)
`3xx(x-1/6)-2xx(x-1/3)=2/3`
`3x-1/2-2x+2/3=2/3`
`x=2/3-2/3+1/2`
`x=1/2`
`3x(x-1/6)-2x(x-1/3)=2/3`
`3x^2 - 1/2 x- 2x^2 + 2/3x = 2/3`
`x^2+1/6 x =2/3`
`x=(-1 \pm \sqrt97)/12`
200-18:(372:3.X-1)-28=166
200-18:(372:3.X-1) =166+28
200-18:(372:3.X-1) =194
200-18:(124.X-1) =194
18:(124.X-1) =200-194
18:(124.X-1) =6
124.X-1 =18:6
124.X-1 =3
124.X =3+1
124.X =4
X =4:124
X =1/31 .
3x/2-1/3=2/5+x
3x/2-x=2/5+1/3
1/2x=11/15
x=11/15:1/2
x=22/15
đúng-**** cho mk nha!!!
=> 3x - 1 (3 + 1 + 32) = 39
=> 3x - 1.13 = 39
=> 3x - 1 = 39/13
=> 3x - 1 = 3
=> x - 1 = 1
=> x = 1 + 1
=> x = 2
tick đi nói cho