( x + 15 ) : 5 + 20 = 25
( x +15 ) : 5 = 25 - 20
( x + 15 ) : 5 = 5
x + 15 = 5 . 5
x + 15 = 25
x = 25 - 15
x = 10
^^ Học tốt!!!
(x + 15) : 5 + 20 = 25
(x + 15) : 5 = 5
x + 15 = 25
x = 25 - 15
x = 10
\(\left(x+15\right):5+20=25\)
\(\Leftrightarrow\left(x+15\right):5=25-20\)
\(\Leftrightarrow x+15=5.5\)
\(\Leftrightarrow x=25-15\)
\(\Leftrightarrow x=10\)
tk mình nha bạn...mơn
(X+15) :5+20=25
(X+15) :5 =25-20
(X+15) :5 = 5
X+15 =5x5
X+15 = 25
X =25-15
X = 10
(x+15) :5+20=25
(x+15) :5 =25-20
(x+15) :5 =5
(x+15) =5*5
(x+15) =25
x =25-15
x =10