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[(6.x-72) : 2 - 84 ] . 28= 5628
[(6.x-72) : 2 - 84] = 5628 :28
[(6.x-72) : 2 - 84] = 201
[(6.x-72) :2 = 201 + 84
[(6.x-72) : 2 = 285
[(6.x-72) = 285 . 2
[(6.x-72) = 570
6.x = 570 + 72
6.x = 642
x = 642 : 6
x = 107
(6.x-72):2-84=5628:28
(6.x-72):2-84=201
(6.x-72):2=201-84=117
6.x-72=117:2
6.x-72=58,5
6.x=58,5+72=130,5
x=130,5:6=21,75
[( 6x - 72 ) : 2 - 84 ] . 28 = 5628
( 6x - 72 ) : 2 - 84 = 5628 : 28 = 201
( 6x - 72 ) : 2 = 201 +84 = 285
6x - 72 = 285 . 2 = 570
6x = 570 + 72 = 642
x = 642 : 6
x = 107
Ta có: [ ( 6 . x - 72 ) : 2 - 84 ] . 28 = 5628
( 6 . x - 72 ) : 2 - 84 = 5628 : 28
( 6 . x - 72 ) : 2 - 84 = 201
( 6 . x - 72 ) : 2 = 201 + 84
( 6 . x - 72 ) : 2 = 285
6 . x - 72 = 285 . 2
6 . x - 72 = 570
6 . x = 570 + 72
6 . x = 642
x = 642 : 6
x = 107
Vậy x = 107
Tìm x, biết :
[( 6.x - 72 ) : 2 - 84 ] . 28 = 5628
( 6.x - 72 ) : 2 - 84 =5628:28
( 6.x - 72 ) : 2 - 84 = 201
( 6.x - 72 ) : 2 =201+84
( 6.x - 72 ) : 2 =285
6x - 72 = 285 . 2
6x - 72 = 570
6x=570+72
6x=642
x=642:6
x=107
[ ( 6 x - 72 ) : 2 - 84 ] . 28 = 5628
(6x - 72) : 2 -84 = 5628:28=201
(6x-72):2=201+84=285
6x-72=285x2=570
6x=570+72=642
x=642:6
x=107
[ ( 6x - 72 ) : 2 - 84 ] . 28 = 5628
( 6x - 72 ) : 2 - 84 = 5628 : 28
( 6x - 72 ) : 2 - 84 = 201
( 6x - 72 ) : 2 = 201 + 84
( 6x - 72 ) : 2 = 285
6x - 72 = 285 x 2
6x - 72 = 570
6x = 570 + 72
6x = 642
x = 642 : 6
x = 107
\(\left[\left(6.x-72\right):2-84\right]\times28=5628\)
\(\left(6.x-72\right):2-84=5628:28\)
\(\left(6.x-72\right):2-84=201\)
\(\left(6.x-72\right):2=201+84\)
\(\left(6.x-72\right):2=285\)
\(6.x-72=285\times2\)
\(6.x-72=570\)
\(6.x=570+72\)
\(6.x=642\)
\(x=107\)
a,(2600+6400)-3 .x = 1200
=> 9000-3 .x= 1200
=> 3.x= 7800
=. x=2600
b, (6.x-72):2-84= 201
(6x-72):2=285
6x-72=570
6x=642
x=107
a) ( 2600 + 6400 ) - 3 . x = 1200
9000 - 3 . x = 1200
3 . x = 9000 - 1200
3 . x = 7800
x = 7800 : 3
x = 2600
a) \(\left(2600+6400\right)-3-x=1200\)
\(\Rightarrow9000-3-x=1200\)
\(\Rightarrow3-x=9000-1200\)
\(\Rightarrow3-x=7800\)
\(\Rightarrow x=7797\)
b) \(\left[\left(6\cdot x-72\right):2-84\right]\cdot28=5628\)
\(\Rightarrow\left[\left(6\cdot x-72\right):2-84\right]=5628:28\)
\(\Rightarrow\left[\left(6\cdot x-72\right):2-84\right]=201\)
\(\Rightarrow\left(6\cdot x-72\right):2=201+84\)
\(\Rightarrow\left(6\cdot x-72\right):2=285\)
Đến dei bạn tự làm, ý b mình không chắc chắn lắm
[(6.x-72):2-84].28= 5628
(6.x-72):2-84=5628:28
(6.x-72):2-84=201
(6.x-72):2=201+84
(6.x-72):2=285
6.x-72=285.2
6.x-72=570
6.x=570+72
6.x=642
x=642:6
x=107