x + 50 - 40 = 50 + 100

x + 50 - 40 = 150

x + 50 = 150 + 40 = 190

x = 190 - 50 = 140

x + 50 - 40 = 50 + 50 x 2

x + 50 - 40 = 150 

x + 50 = 150 + 40 

x + 50 = 190 

x = 190 - 50 

x = 140 

ai k mik mik thề sẽ k lại hứa đó

x + 50 - 40 = 50 + 50 x 2

x + 50 - 40 = 50 x ( 1 + 2 )

x + 50 - 40 = 50 x 3

x + 50 - 40 = 150

x + 50 = 150 + 40

x + 50 = 190

x = 190 - 50

x = 140

mình nha 

(x² + 1) + (x² + 2) + ... + (x² + 50) = 1475

x² + 1 + x² + 2 + ... + x² + 50 = 1475

50x² + (1 + 2 + ... + 50) = 1475

50x² + 50 . 51 : 2 = 1475

50x² + 1275 = 1475

50x² = 1475 - 1275

50x² = 200

x² = 200 : 50

x² = 4

x = 2 hoặc x = -2

x + 12 x 2 = 50 + 50

x + 12 x 2 = 100

x + 24 = 100

        x = 100 - 24

        x = 76

x + 12 x 2 = 50 + 50

x+12x2=100

x+24=100

x=100-24

x=76

x + 12 x 2 = 50 + 50

x + 24 = 100

x = 100 - 24

x = 76

k mk nha

2.(x-2)^2=50

=>(x-2)^2=50:2=5^2

=>x-2=5

=>x=7

=>2x+2+6.5x=50

=>2x+2+30x=50

=>2x+30x=50-2

=>32x=48

=>x=48:32

=>x=3/2

x + 10 x 2 = 50 x 2

x + 20 = 100

        x = 100 - 20

        x = 80

tìm x:

 x + 10 x 2 = 50 x 2

=>x+10x2=100

=>x+20=100

=>x=100-20

=>x=80

bấm **** nha 

x + 10 x 2 = 50 x 2

x + 10 x 2 = 100

x + 10 = 100 : 2

x + 10 = 50

        x = 50 - 10

        x = 40

ai nhanh mik k

`(2/5-x)^3*50%=1/2`

`=>(2/5-x)^3*1/2=1/2`

`=>(2/5-x)^3=1/2:1/2`

`=>(2/5-x)^3=1`

`=>2/5-x=1`

`=>x=2/5-1`

`=>x=2/5-5/5`

`=>x=-3/5`

\(\left(\dfrac{2}{5}-x\right)^3\times50\%=\dfrac{1}{2}\\ \Rightarrow\left(\dfrac{2}{5}-x\right)^3\times\dfrac{1}{2}=\dfrac{1}{2}\\ \Rightarrow\left(\dfrac{2}{5}-x\right)^3=\dfrac{1}{2}:\dfrac{1}{2}\\ \Rightarrow\left(\dfrac{2}{5}-x\right)^3=\dfrac{1}{2}\times2\\ \Rightarrow\left(\dfrac{2}{5}-x\right)^3=1\\ \Rightarrow\dfrac{2}{5}-x=1\\ \Rightarrow x=\dfrac{2}{5}-1\\ \Rightarrow x=\dfrac{2}{5}-\dfrac{5}{5}\\ \Rightarrow x=\dfrac{-3}{5}\)