(600-x)-x=450
600-x-x=450
600-(x+x)=450
600-2x=450
2x=150
x=75

\(\left(600-x\right)-x=450\)

\(\Rightarrow600-x-x=450\)

\(\Rightarrow600-2x=450\)

\(\Rightarrow2x=600-450\)

\(\Rightarrow2x=150\)

\(\Rightarrow x=150:2\)

\(\Rightarrow x=75\)

Học tốt #

( 600 - x ) - x = 450

\(\Rightarrow\)600 - x - x = 450

\(\Rightarrow\)600 - ( x + x ) = 450

\(\Rightarrow\)600 - 2x = 450

\(\Rightarrow\)2x = 600 - 450 = 150

\(\Rightarrow\)x = 150 : 2 = 75

vậy x = 75

chúc bạn học tốt !!!

a) 450 – ( 25 – 10) = 450 – 15

                   = 435

450 – 25 – 10 = 425 – 10

                   = 415

b) 180 : 6 : 2 = 30 : 6

                   = 15

180 : ( 6 : 2 ) = 180 : 3

                   = 60

c) 410 – (50 +30) = 410 -80

                   = 330

410 - 50 + 30 = 360 + 30

                   = 390

d) 16 x (6 : 3) = 16 x 2

                   = 32

16 x 6 : 3 = 96 : 3

                   = 32

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\(\frac{450}{2^X-19}=180\)

\(2^X-19=\frac{450}{180}\)

\(2^X-19=2,5\)

\(2^X=19+2,5\)

\(2^X=21,5\)

\(=600:\left\{450:\left[450-\left(500-200\right)\right]\right\}\)

\(=600:\left\{450:\left[450-300\right]\right\}\)

\(=600:3=200\)

=600:{450:[450-(4.125-8.25)]}

=600:{450:[450-(8.125-4.25)]}

=600:{450:[450-300]

=600:{450:150}

=600:3

=200

Lần sau bn nhớ ghi đúng thứ tự ngoặc nhé

x+600= \(\dfrac{180x}{100}\)- 360
x- \(\dfrac{180x}{100}\)= -600- 360
\(\dfrac{-80x}{100}\)= -960
-80x= -960.100
x= 1200

a. x : [( 1800 + 600 ) : 30] = 560 : (315 - 35)

x : [2400 : 30] = 560 : 280

x : 80 = 2

x = 2 . 80

x = 160

b. [( 250 - 25 ) : 15] : x = ( 450 - 60 ) : 130

= [ 225 : 15 ] : x = 390 : 130

= 15 : x = 3

x = 15 : 3

x = 5

để thừa số chung là 7 đi

 5 x 7 x 77 -7 x 60 + 49 x25 - 15 x 42

=7x385-7x60+49x25-15x42

=7x(385-60)+49x25-15x42

=7x325+49x25-15x42

=2275+49x25-15x42

=2275+1225-630

=3500-630

=2870