70-5(x-3)=45
5(x-3)=70-45=25
x-3=25:5=5
x=5+3=8
Đáp số : x=8
70- 5. ( x - 3)= 45
5 ( x -3 ) = 70 - 45
5 ( x -3 ) = 25
x -3 = 25 : 5
x -3 = 5
x = 5 + 3
x = 8
70 - 5. ( x - 3 ) = 45
70 - 5.x - 5.3 = 45
70 - 5.x - 15 = 45
70 - 15 - 5.x = 45
55 - 5.x = 45
5x = 55 - 45 = 10
x = 10 : 5 = 2
70 - 5 . ( x - 3 ) = 45
5 . ( x - 3 ) = 70 - 45
5 . ( x - 3 ) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
70-5.(x-3)=45
5.(x-3)=70-45
5.(x-3)=25
x-3=25:5
x-3=5
x=5+3
x=8
70 - 5 x ( x - 3 ) = 45
5 x ( x - 3 ) = 70 - 45
5 x ( x - 3) = 25
( x - 3 ) = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
Vậy x = 8
CHÚC BẠN HỌC TỐT
70 - 5 . ( x - 3 ) = 45
5 . ( x - 3 ) = 70 - 45
5 . ( x - 3 ) = 25
( x - 3 ) = 25 : 5
( x - 3 ) = 5
x = 5 + 3
x = 8
Chúc bạn hok tốt !!!
\(70-5\left(x-3\right)=45\)
\(\Leftrightarrow70-5x+15=45\)
\(\Leftrightarrow-5x+85=45\)
\(\Leftrightarrow-5x=-40\)
\(\Leftrightarrow x=8\)
chac chan 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000%x=8