8,75 x X + 1,25 x X = 20

X = 20 : (8,75 + 1,25)

X = 2

vậy X = 2

8,75 * x + 1,25 * x = 20

x * ( 8,75 + 1,25 ) * x = 20

1 * x = 20

x = 20 : 1 = 20

8,75 x X + 1,25 x X = 20

X = 20 : (8,75 + 1,25)

X = 2

vậy X = 2

8,75 x X + 1,25 x X=20

=> (8,75+1,25) x X=20

=> 1 x X=20

=> X=20:1=20

8,75 x X + 1,25 x X =20

  X x ( 8,75 + 1,25) = 20

          X x 10 = 20

               X = 2 

8,75 x X + 1,25 x X = 20

X = 20 : (8,75 + 1,25)

X = 2

vậy X = 2

8,75 * x + 125 * x = 20

( 8,75 + 1,25) * x = 20

         10        * x  = 20

          X              = 20 : 10

          X              =    2

Mình cũng ra  đáp án 2 .Bạn nhé

 Ta có 8,75 x X + 1,25 x X = 20

⇒(8,75+1,25)×X=20

⇒10×X=20

⇒X=20÷10

⇒X=2

Vậy X=2

\(8.75\times x+1.25\times x=20\)

\(x\times\left(8.75+1.25\right)=20\)

\(10\times x=20\)

\(x=20:10=2\)

8,75 * x + 1,25 * x = 20 

⇔ x * ( 8,75 + 1,25 ) = 20 

⇔ x * 10 = 20 

⇔ x = 20 : 10 

⇔ x = 2

x.(8,75+1,25)=20

x.10=20

x=20:10

x=2

8,75 x X+1,25 x X=20

(8,75+1,25) x X=20

10 xX =20

X=20 :10

X=2

k cho mình nha

8.75 x X + 1.25 x X = 20

( 8.75 +1.25 ) x X = 20

10 x X = 20

X = 20 : 10 

X = 2

8,75 x X+1,25 x =20

X x(8,75+1,25)=20

X x 10 =20

X = 20 chia 10

X=10

8,75*x+1,25*x=20

x*(8,75+1,25)=20

x*10=20

x=20:10

x=2

8,75 * x + 1,25 * x = 20

x * (8,75 + 1,25 ) = 20

x *  10 = 20

x =  20 : 10

x = 2 

cau hoi tuong tu

\(8,75.x1,25x=20\)

\(\Rightarrow10x=20\)

\(\Rightarrow x=20:10=2\)

vậy x = 2

\(8,75\times x+1,25\times x=20\)

\(x\times\left(8,75+1,25\right)=20\)

\(x\times10=20\)

\(x=2\)

#chuk bn hok tốt ạ !