\(1500:\left(30x+40\right):2=30\)

⇔ \(750:\left(30x+40\right)=30\)

⇒ \(30x+40=750:30=25\)

⇔ \(30x=-15\)

⇔ \(x=-\dfrac{1}{2}\)

Chỉ giúp em vs ah

Sửa đề: \(1500:\left[\left(30x+40\right):2\right]=30\)

\(\Rightarrow\left(30x+40\right):2=50\)

\(\Rightarrow30x+40=100\)

\(\Rightarrow30x=60\Rightarrow x=2\)

ko chia đc bạn nha

nếu chia thì x tương đương -1,33422281521

\(1500:\left[\left(30x+40\right):x\right]=30\)

\(\left[\left(30x+40\right):x\right]=1500:30\)

\(\left[\left(30x+40\right):x\right]=50\)

\(30x:x+40:x=50\)

\(30+40:x=50\Leftrightarrow40:x=50-30\)

\(40:x=20\Leftrightarrow x=40:20\Leftrightarrow x=2\)

1500 : [(30.x+40):x] = 30

\(\left(30.x+40\right):x=50\)

=> 30.x + 40 = 50.x

=> 30.x - 50.x = -40

-20x = -40

x = 2

cảm ơn mọi người

hung pham tien bn vào câu hỏi tương tự đi , có đấy 

 **** cho minh 

\(1500:\left[\left(30x+40\right):x\right]=30\)

\(\Leftrightarrow\left(30x+40\right):x=50\)

\(\Leftrightarrow30x+40=50x\)

\(\Leftrightarrow50x-30x=40\)

\(\Leftrightarrow20x=40\)

\(\Leftrightarrow x=2\)

Vậy ..

1500 : [ ( 30x + 40 ) : x ] = 30

[ ( 30x + 40 ) : x ] = 1500 : 30

[ ( 30x + 40 ) : x ] = 50

( 30x + 40 ) = 50 . x

( 30x + 40 ) = 50x

40 = 50x - 30x

40 = 20x

x = 40 : 20

x = 2

Vậy x = 2