[(6x - 72):2 - 84].28=5628
(6x - 72):2-84=201
(6x - 72):2 = 285
6x - 72 = 570
6x = 642
x = 107
=.= hok tốt!!
[(6x - 72) : 2 - 84] x 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
Học tốt!!!
\(\left[\left(6x-72\right)\div2-84\right].28=5628\)
\(\Rightarrow\left[\left(6x-72\right)\div2-84\right]=5628\div28\)
\(\Rightarrow\left[\left(6x-72\right)\div2-84\right]=201\)
\(\Rightarrow\left(6x-72\right)\div2=201+84\)
\(\Rightarrow3x-36=285\)
\(\Rightarrow3x=285+36\)
\(\Rightarrow3x=321\)
\(\Rightarrow x=321\div3\)
\(\Rightarrow x=107\)
\(\text{[(6x-72):2-84].28=5628}\)
\(\left(6x-72\right):2-84=5628\div28\)
\(\left(6x-72\right)\div2-84=201\)
\(\left(6x-72\right)\div2=201+84\)
\(\left(6x-72\right)\div2=285\)
\(6x-72=285\times2\)
\(6x-72=570\)
\(6x=570+72\)
\(6x=642\)
\(x=642:6\)
\(x=107\)
