8,75×x+1,25×x=20

(8,75+1,25)×x=20

10×x=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

Vậy x = 2

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

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

x*10=20

x=20:10

x=2

k cho mink nha!

8,75 * x + 1 ,25 * x = 20 

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

=10* x =20

        x=20:10 

        x = 2

8.75 * x + 1.25 * x = 20]

( 8.75 + 1.25 ) * x = 20

10 * x = 20

x = 20 : 10

x = 2

Dấu \(.\)là dấu nhân 

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

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

\(\Rightarrow10.x=20\)

\(\Rightarrow x=20:10\)

\(\Rightarrow x=2\)

Vậy \(x=2\)

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 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

\(15x=10y=6z\)

\(\Rightarrow\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{5}\)

Áp dụng t/c dtsbn:

\(\dfrac{x}{2}=\dfrac{y}{3}=\dfrac{z}{5}=\dfrac{x+y+z}{2+3+5}=\dfrac{20}{10}=2\)

\(\Rightarrow\left\{{}\begin{matrix}x=2.2=4\\y=2.3=6\\z=2.5=10\end{matrix}\right.\)

tham khảo

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

x=2

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

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

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

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

\(x=-2.6\)