Xin cac ban giup mik voi
\(\left[\left(6x-72\right):2-84\right].28=5628\)
\(\Leftrightarrow\left(6x-72\right):2-84=5628:28\)
\(\Leftrightarrow\left(6x-72\right):2-84=201\)
\(\Leftrightarrow\left(6x-72\right):2=201+84\)
\(\Leftrightarrow\left(6x-72\right):2=285\)
\(\Leftrightarrow6x-72=285.2\)
\(\Leftrightarrow6x-72=570\)
\(\Leftrightarrow6x=570+72\)
\(\Leftrightarrow6x=642\)
\(\Leftrightarrow x=642:6\)
\(\Leftrightarrow x=107\)
Vậy \(x=107\)
[(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
Vậy x = 107
\(\)b) [(6 . x - 72) : 2 - 84] . 28 = 5628
\(\Rightarrow\) (6x - 72) : 2 - 84 = 201
\(\Rightarrow\) (6x - 72) : 2 = 285
\(\Rightarrow\) 6x - 72 = 570
\(\Rightarrow\) 6x = 642
\(\Rightarrow\) x = 107
\(\left[\left(6x-72\right):2-84\right]\cdot28=5628\)
\(\Rightarrow\left(6x-72\right):2-84=201\)
\(\Rightarrow\left(6x-72\right):2=285\)
\(\Rightarrow6x-72=142,5\)
\(\Rightarrow6x=214,5\)
\(\Rightarrow x=35,75\)
[(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=642
x= 642 : 6
x=107
CAM ON NHIU !