X + X x 3 = 48

       X x (1+3) = 48

       X x 4 = 48

       X = 48 : 4

       X = 12

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12

X + X x 3 = 48

X x 4 = 48

X = 48 : 4

X = 12

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\(x+x\times3=48\)

\(\Leftrightarrow4x=48\)

\(\Leftrightarrow x=48:4\)

\(\Leftrightarrow x=12\)

cảm ơn bạn rất nhiều nha 

x^2 - x - x^2 - 3x = - 48
      - x - 3x         = - 48
          -4x           = - 48
             x           = - 48 : ( -4 )
             x           = 12

x^2-x-x^2-3x=-48

=>-4x=-48

=>x=12

X x 1 + X x 3 = 48

X x (1+3) = 48

X x 4 = 48

X = 48 : 4

X = 12

X + X * 3 = 48

x*1+x*3=48

x*(1+3)=48

x*4=48

x=12

\(\Rightarrow\) X x 1 + X x 3 = 48

\(\Rightarrow\) X x (1+3) = 48

\(\Rightarrow\) X x 4 = 48

\(\Rightarrow\)X = 48 : 4

\(\Rightarrow\) X = 12

x : 5 = 13   x : 6 = 25   x : 3 = 48

x = 13 x 5   x = 25 x 6   x = 48 x 3

x = 65   x = 150   x = 144

\(x-\left[3+\left(2^4.3-48:6-3\right)\right]=10\)

\(x-\left[3+\left(16.3-8-3\right)\right]=10\)

\(x-\left[3+48-8-3\right]=10\)

\(x-40=10\)

\(x=50\)

\(x-\left[3+\left(2^4.3-48:6-3\right)\right]=10\)

\(x-\left[3+\left(16.3-48:6-3\right)\right]=10\)

\(x-\left[3+48-8-3\right]=10\)

\(x-46=10\)

\(x=10+46\)

\(x=56\)

\(x-\left[3+\left(2^4.3-48:6-3\right)\right]=10\)

\(x-\left[3+\left(48-8-3\right)\right]=10\)

\(x-\left[3+37\right]=10\)

\(x-40=10\)

\(x=10+40\)

\(x=50\)

x+3*x=48

x*(3+1)=48

x*4=48

x=48:4

x=12

x+3*x=48

1*x+3*x=48

4*x=48

x=48:4

x=12