[ ( 4 . x - 72) : 2 - 84] . 28 = 56
tìm x
a. 120 + ( 56 - 2x ) .3 = 156
b. 3x - 2^3 = 3^2 + 1^21
c. [( 6x - 72 ) : 2 - 84] 28 = 5628
[(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
\(120+\left(56-2x\right).3=156\)
\(\left(56-2x\right).3=156-120\)
\(\left(56-2x\right).3=36\)
\(56-2x=36:3\)
\(56-2x=12\)
\(2x=56-12\)
\(2x=44\)
\(x=44:2\)
\(x=22\)
[(6.x-72)].2-84].28=5628
[(6.x-72):2-84].28=5628
[(6.x-72):2-84].28=5628
(6.x-72):2-84=5628:28=201
(6.x-72):2=201+84=285
6.x-72=285.2=570
6.x=570+72=642
x=642:6=107
[(6.x-72):2-84].28=5628 (6.x-72):2-84=5628:28 (6.x-72):-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] . 28 = 5628
= 11,75
k mik nha Mina Le
mik lỡ ấn trả lời thôi tạm bỏ qua nhé
[( 6 . x - 72 ) : 2 - 84 ] = 5828 : 28 = 201
( 6 . x -72) : 2 = 201 + 84=285
6 . x - 72 = 142,5
6 . x = 142,5 - 72 =70,5
x = 70,5 : 6
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[ {6 x-72}:2-84].28=5628
[(6 . x - 72) : 2 - 84].28 = 5628
[(6.x-72):2-84].28=5628
[(6.x-72):2-84].28=5628
(6.x-72):2-84=5628:28
(6x-72):2-84=201
(6x-72):2=201+84
(6x-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 = 201
=> (6x - 72) : 2 = 285
=> 6x - 72 = 570
=> 6x = 642
=> x = 107