Question

tìm x: 

   321-5*(x+2)=4*3²

 

Answer 1

321-5x(X+2)=4x9

321-5x(X+2)=36

X+2=(321-36):5

X+2=57

X=57-2

X=55

vay X=55

k minh nha

làm ơn đó

Answer 2

   321-5*(x+2)=4*3²

^<=> 321-5*(x+2)=36

<=>5*(x+2)= 321-36= 285

<=>x+2= 285:5= 57

<=>x= 57-2= 55

Answer 3

321-5(x+2)=4.3²

321-5(x+2)=4.9

321-5(x+2)=36

       5(x+2)=321-36

       5(x+2)=285

          x+2=57

          x    =57-2

          x    =55

tk mik nha

Answer 4

\(321-5.\left(x+2\right)=4.3^2\)

\(\Rightarrow321-5.\left(x+2\right)=36\)

\(\Rightarrow5.\left(x+2\right)=321-36\)

\(\Rightarrow5.\left(x+2\right)=285\)

\(\Rightarrow x+2=57\)

\(\Rightarrow x=55\)