X+78*X+25*X+X*4=78,6+121,4

X*1+78*X+25*X+X*4=200

X*(1+78+25+4)=200

X*108=200

X=200/108

y + 78 x y + 25 x y - y x 4 = 78,6 + 121,4

y x ( 1 + 78 + 25 - 4 ) = 200

y x 100 = 200

y = 200 : 100

y = 2

X x ( 1 + 78 + 25 - 4) = 200

X x 100 = 200 

X = 2

=>100x=200

=>x=2

 Dấu \("."\)là dấu nhân nhé !!! 

\(x+78.x+25.x-x.4=7,6+121,4\)

\(\Rightarrow x.1+78.x+25.x-x.4=200\)

\(\Rightarrow x.\left(1+78+25-4\right)=200\)

\(\Rightarrow x.100=200\)

\(\Rightarrow x=200:100\)

\(\Rightarrow x=2\)

Vậy \(x=2\)

Chúc bạn học tốt !!! 

x+78x+25x-4x=78,6+121,4

100x=200

x=2

Vậy x=2

x+78x+25x-4x=200

100x=200

x=200:100

x=2 

các bn viết rõ đc ko

x + 78*x + 25*x + x*4=78,6 + 121,4

x*(1+78+25-4)=200

x* 100 =200

x = 200:100

x = 2

\(x+78\times x+25\times x-4\times x=78,6+121,4\)

\(\Rightarrow x\times\left(1+78+25-4\right)=200\)

\(\Rightarrow x\times100=200\)

\(\Rightarrow x=200\div100\)

\(\Rightarrow x=2\)

Vậy x=2

x + 78 * x + 25 * x - x * 4  = 78,6 + 121,4

x * ( 1 + 78 + 25 - 4 ) = 200

                    x * 100 = 200

                             x = 200 : 100

                             x = 2

                        Vậy x = 2

\(x\) + 78 x \(x\)+ 25 x \(x\)- \(x\)x 4 = 78,6 + 121,4

\(x\)x 1 + 78 x \(x\)+ 25 x \(x\)- \(x\)x 4 = 200

\(x\)x ( 1 + 78 + 25 - 4 ) = 200

\(x\)x 100 = 200

\(x\)= 200 : 100

\(x\)= 2

X + 78 * X + 25 * X - X * 4 = 78,6 + 121,4

X * ( 1 + 78 + 25 - 4 ) = 200

                     X * 100 = 200

                             X = 200 : 100

                            X = 2

                        Vậy X = 2 

y * ( 1+78+25-4)=200

y * 100 = 200

y = 200/100  

y=2

y+78y+24y-4y=78,6+121,4 

100y=200 

y=200:2 

y=100 

y + 78 x y + 25 x y - y x 4 = 200

y x 1 + y x 78 + y x 25 + y x 4 = 200

y x ( 1 + 78 + 25 - 4 ) = 200

y x 100 = 200

y  = 200 : 100

y = 2

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