A

lộn

A

=838 nha bn

40+30+50+70+8+65+12+30+40+10+483=838

16583

\(5x+40:2=45\)

\(5x+20=45\)

\(5x=45-20\)

\(5x=25\)

\(x=25:5\)

\(x=5\)

_______

\(x+30=40-2.5^2\)

\(x+30=40-2.25\)

\(x+30=40-50=-10\)

\(x=\left(-10\right)-30\)

\(x=-40\)

bạn tui làm đúng ghê!!!

@Phương

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

⇔ \(750:\left(30x+40\right)=30\)

⇒ \(30x+40=750:30=25\)

⇔ \(30x=-15\)

⇔ \(x=-\dfrac{1}{2}\)

Chỉ giúp em vs ah

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

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

\(\Rightarrow30x+40=100\)

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

a,

36 x 40 = (36 x 4) x 10 = 144 x 10 = 1 440

72 x 60 = (72 x 6) x 10 = 432 x 10 = 4 320

89 x 50 = (89 x 5) x 10 = 445 x 10 = 4 450

b,

450 x 70 = (45 x 7) x 100 = 315 x 100 = 31 500

2300 x 500 = (23 x 5) x 10 000 = 115 x 10 000 = 1 150 000

17 000 x 30 = (17 x 3) x 10 000 = 510 000

x+40=30x2

x+40=60

     x=60-40

     x=20

k mình nha

x + 40 = 30 x 2

x + 40 = 60

x = 60 - 40

x = 20 

x+40=60

x=60-40

x=20

tk minh nha

lớp 8 ???

\(\dfrac{x}{30}+\dfrac{1}{2}+\dfrac{x}{40}=5+\dfrac{1}{6}\)

\(\Leftrightarrow\dfrac{x}{30}+\dfrac{x}{40}=\dfrac{14}{3}\)

\(\Leftrightarrow\dfrac{4x+3x}{120}=\dfrac{560}{120}\)

\(\Leftrightarrow7x=560\)

\(\Leftrightarrow x=80\)

= 80