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a) Xem lại đề.
b) 5. (x - 3)2 + 17 = 142
5. (x - 3)2 = 142 - 17
5. (x - 3)2 = 125
(x - 3)2 = 125 : 5
(x - 3)2 = 25
(x - 3)2 = 52 (cùng số mũ)
⇒ x - 3 = 5
x = 5 + 3 = 8
c) [(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. 2
6x - 72 = 570
6x = 570 + 72
6x = 642
x = 642 : 6
x = 107
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[(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
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= 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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![](https://rs.olm.vn/images/avt/0.png?1311)
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![](https://rs.olm.vn/images/avt/0.png?1311)
(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
\([(6\cdot x-73):2-84]\cdot28=5628\\(6x-73):2-84=5628:28\\(6x-73):2-84=201\\(6x-73):2=201+84\\(6x-73):2=285\\6x-73=285\cdot2\\6x-73=570\\6x=570+73\\6x=643\\x=643:6\\x=\dfrac{643}{6}\\Vậy:x=\dfrac{643}{6}\)
\(\left[\left(6x-73\right):2-84\right]\cdot28=5628\)
\(\left(6x-73\right):2-84=201\)
\(\left(6x-73\right):2=285\)
\(6x-73=570\)
\(6x=643\)
\(x=\dfrac{643}{6}\)