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134-2.{156-6.[54-2.(9+6)]}.x=86
2.{156-6.[54-2.15]}.x=134-86
2.{156-6.[54-30]}.x=48
2.{[156-6.24]}.x=48
2.{[156-144]}.x=48
2.{12}.x=48
24.x=48
x=48:24
x=2
Vậy x=2
Chúc bn học tốt
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![](https://rs.olm.vn/images/avt/0.png?1311)
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134 - 2 . {156 - 6[54 - 2(9 + 6)]} . x = 86
134 - 2 . { 156 - 6 [ 54 - 2 . 15 ) ] } . x = 86
134 - 2 . { 156 - 6 [ 54 - 30 ] } . x = 86
134 - 2 . { 156 - 6 . 24 } . x = 86
134 - 2 . { 156 - 144 } . x = 86
134 - 2 . 21 . x = 86
2 . 21 . x = 134 - 86
2 . 21 . x = 48
21 . x = 48 : 2
21 . x = 24
x = 24 : 21
x = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
134 - 2.{ 156 - 6 .[ 54 - 2 .( 9 + 6 )]} . x = 86
134 - 2.{ 156 - 6 .[ 54 - 2 . 15 ]} . x = 86
134 - 2.{ 156 - 6 .[ 54 - 30 ]} . x= 86
134 - 2.{ 156 - 6 . 24 } . x = 86
134 - 2.{ 156 - 144 } . x = 86
134 - 2 . 12 . x = 86
134 - 24 . x = 86
24 . x = 134 - 86
24 . x = 48
x = 48 : 24
x = 2
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\(5.\left[225-\left(x-10\right)-125\right]=0\)
\(225-\left(x-10\right)-125=0:5\)
\(225-\left(x-10\right)-125=0\)
\(\left(x-10\right)-125=225-0\)
\(\left(x-10\right)-125=225\)
\(x-10=225+125\)
\(x-10=350\)
Mấy bài này làm theo thứ tứ trái sang phải, nhân chia trc cộng trừ sau thoi mà :>>>?
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 120:{50.50:[450 - (4.125 - 4.25)]}
= 120:{50.50:[450 - (4.25.5 - 4.25)]}
= 120:{50.50:[450 - (4.25(5 - 1))]}
= 120:{50.50:[450 - (100.4)]}
= 120:{50.50:[450 - 400]}
= 120:{50.50:50}
= 120:50
= 12/5
a) (2x - 4)(48 - 12x) = 0
=> 2(x - 2).12(4 - x) = 0
=> (x - 2)(4 - x) = 0 (2 và 12 khác 0)
=> x - 2 = 0 hay 4 - x = 0
=> x = 2 I => x = 4
b) 134 - 2{156 - 6[54 - 2(9 + 6)]}x = 86
=> 134 - 2{156 - 6[54 - 2.15]}x = 86
=> 134 - 2{156 - 6[54 - 30]}x = 86
=> 134 - 2{156 - 6.24}x = 86
=> 134 - 2{12.13 - 12.2.6}x = 86
=> 134 - 2{12[13 - 2.6]}x = 86
=> 134 - 2{12[13 - 12]}x = 86
=> 134 - 2{12.1}x = 86
=> 134 - 2.12x = 86
=> 134 - 24x = 86
=> 24x = 48
=> x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
134-2{156-6[54-2.(9+6)]}.x=80
=>2.{156-6.[54-2.15]}.x=134-80
=>2.{156-6.[54-30]}.x=54
=>{156-6.24}.x=54:2
=>{156-144}.x=27
=>12.x=27
=>x=27/12
134-2.{156-6.[54-2.(9+6)]}.x=86
<=>134-2.{156-6.[54-2.15]}.x=86
<=>134-2.{156-6.24}.x=86
<=>134-2.12.x=86
<=>134-24.x=86
<=>24.x=134-86
<=>24.x=48
<=>x=48:24
<=>x=2
Vậy...
k mik nhé
Thanks