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x * 2 + x * 3 + x * 4 + x = 2130
x * (2 + 3 + 4 + 1) = 2130
x * 10 = 2130
x = 2130 : 10 = 213
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 50 - 40 = 50 + 100
x + 50 - 40 = 150
x + 50 = 150 + 40 = 190
x = 190 - 50 = 140
x + 50 - 40 = 50 + 50 x 2
x + 50 - 40 = 150
x + 50 = 150 + 40
x + 50 = 190
x = 190 - 50
x = 140
ai k mik mik thề sẽ k lại hứa đó
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(X:\dfrac{3}{9}=\dfrac{7}{8}\)
\(X=\dfrac{7}{8}\times\dfrac{3}{9}\)
\(X=\dfrac{21}{72}\)
\(\left(X-21\times13\right):11=30\)
\(X-273=330\)
\(X=603\)
`x:3/9=7/8`
`x=7/8xx3/9`
`x=7/24`
`-------------`
`(x-21xx13):11=30`
`(x-273):11=30`
`x-273=30xx11`
`x-273=330`
`x=330-273`
`x=57`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x=\dfrac{4}{5}\times\dfrac{4}{3}\)
\(x=\dfrac{16}{15}\)
-----------------------
\(x=\dfrac{5}{9}\times\dfrac{3}{8}\)
\(x=\dfrac{5}{24}\)
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1000 + x = 20 + 20
1000 + x = 40
x = 1000 - 40
x = 960
tính nhanh
50 x 2 + 50 x 2 = 200
\(1000+x=20+20\)
\(1000+x=40\)
\(x=40-1000\)
\(x=-960\)
\(50x2+50x2\)
\(=50x\left(2+2\right)\)
\(=50x4\)
\(=200\)
\(K\)\(nha\)\(ban!!!\)
x + 12 x 2 = 50 + 50
x + 12 x 2 = 100
x + 24 = 100
x = 100 - 24
x = 76
x + 12 x 2 = 50 + 50
x+12x2=100
x+24=100
x=100-24
x=76