tham khảo

8,75 * x + 1,25 * x = 20
<=>10*x=20
<=>x=20 : 10 
<=> x=2

x=2

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

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

\(x\times-7,5=20\)

\(x=20\div\left(-7,5\right)\)

\(x=-2.6\)

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 x = 20

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

10 x x = 20

x = 20 : 10

x = 2

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

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

m x 10=20

m=2

Ta có: \(8.75\cdot m+1.25\cdot m=20\)

\(\Leftrightarrow m\cdot10=20\)

hay m=2

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

⇒m x (8,75+1,25)=20

⇒m x 10=20

⇒m=20:10

⇒m=2

8,75×X+1,25×X=20

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

x*10=20

x=2

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

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

       10      *X=20

                  X=20:10

                 X=2

x = 2

ai k mk 

mk k lại

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

X .10=20

X=20 : 10

X =2

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

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

\(\Leftrightarrow\)\(x.10=20\)

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

Ai thấy đúng thì ủng hộ nha !!!

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

2x = 20 : (8, 75 + 1, 25)

x = 20 : 10

x = 2