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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
a) \(3x-18.28:14=308\)
\(=>3x-36=308\)
\(=>3x=344\)\(\)
\(=>x=\frac{344}{3}\)
\(\)b)\(38+\left|x\right|=\left(-12\right)+65\)
\(=>38+\left|x\right|=53=>\left|x\right|=15=>\orbr{\begin{cases}x=15\\x=-15\end{cases}}\)
c)\(15+3.\left(x-1\right):5=30\)
\(=>15+3.\left(x-1\right)=150\)
\(=>3.\left(x-1\right)=135\)
\(x-1=45=>x=46\)
d) \(5.\left(7-3x\right)+7.\left(2+2x\right)=1\)
\(=>35-15x+14+14x=1\)
\(=>49-x=1=>x=48\)
e)\(3.\left(x-7\right)=21\)
\(=>x-7=7=>x=14\)
g)\(\left[\left(6x-72\right):2-84\right]:28=5628\)
\(\left(6x-72\right):2-84=157584\)
\(\left(6x-72\right):2=157668\)
\(6x-72=315336\)
\(6x=315408=>x=52568\)
h)\(123-5\left(x+4\right)=28\)
\(5.\left(x+4\right)=95\)
\(x+4=19=>x=15\)
p)\(14.\left(x-3\right)-138=73\)
\(14.\left(x-3\right)=211\)
\(x-3=\frac{211}{14}=>x=\frac{253}{14}\)
\(t\)
\(\left|x\right|-5=2\)
\(\left|x\right|=7=>\orbr{\begin{cases}x=7\\x=-7\end{cases}}\)
v)\(4x-72=\left|100-8.25\right|\)
\(4x-72=\left|-100\right|\)
\(4x-72=100=>4x=172=>x=43\)
cậu có thể tham khảo bài làm trên đây ạ, chúc cậu học tốt ^^
b,\(7^5\)\(.(3x-2^3\)\()=7^6\)
\(3x-2^3\)\(=7^6:7^5=7^1=7\)
\(3x=7+8\)
\(3x=15\)
\(x=15:3\)
\(x=5\)
c,\(96-3(x-5)=57\)
\(3(x-5)=96-57\)
\(3(x-5)=39\)
\(x-5=39:3\)
\(x-5=13\)
\(x=13+5\)
\(x=18\)
d,\([(6x-72):2-84].28=5628\)
\((6x-72):2-84=5628:28\)
\((6x-72):2-84=201\)
\((6x-72):2=201+84\)
\((6x-72):2=285\)
\((6x-72)=285.2\)
\(6x-72=570\)
\(6x=570+72\)
\(6x=642\)
\(x=642:6\)
\(x=107\)
b)
75 . ( 3x - 23 ) = 74 . 72
75 . ( 3x - 8 ) = 76
3x - 8 = 7
3x = 15
x = 5.
Vậy x = 5.
c)
96 - 3( x - 5 ) = 57
3( x - 5 ) = 39
x - 5 = 13
x = 18.
Vậy x = 18.
d)
[ ( 6x - 72 ) : 2 - 84 ] . 28 = 5628
( 6x - 72 ) : 2 - 84 = 201
( 6x - 72 ) : 2 = 285
6x - 72 = 570
6x = 642
x = 107.
Vậy x = 107.
A )123 -5 ( x -4 ) = 38
=> x-4 = (123-38) :(-5)
=> x-4=-17
=> x= -17+4=-13
B ) ( 3x - 24 ) 73 = 2.74
=> 3x-16= 2.74 :73=14
=> 3x=14+16=30
=> x=30:3=10
C ) ( 2600 + 6400 ) - 3x = 1200
=> 9000-3x=1200
=> 3x=9000-1200=7800
=> x=7800:3=2600
D ) [( 6x - 72 ) : 2 - 84 ] 28 = 5628
=> (6x-72) :2-84= 5628:28=201
=> 6x-72 = (201+84) .2=570
=> 6x=570 +72=642
=> x= 642:6=107
( L-IKE )
A) 123 - 5(x-4) = 38
5(x-4) = 123 - 38
x-4 = 85 : 5
x = 17 + 4
x= 21
B) (3x - 24)73 = 2.74
(3x - 24) = 2.74:73
3x = 14 + 24
x = 30 : 3 = 10
C) (2600 + 6400) - 3x = 1200
9000 - 3x = 1200
3x = 9000 - 1200
x = 7800 : 3 = 2600
D) [(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 = 107
Có thể thử lại đáp án
a, ( 2600 + 6400 ) - 3.x = 1200
9000 - 3x = 1200
3x = 9000 - 1200
3x = 7800
x = 2600
b, [ ( 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 = 208 x 2
6.x - 72 = 416
6.x = 416 + 72
6.x = 488
x = 244/3
a)(2600 + 6400) - 3.x = 1200
9000 -3.x = 1200
3.x =9000-1200
3.x=7800
x=7800:3
=2600
nói chung bài bn CÔNG CHÚA XINH XẮN ĐÚNG RỒI
5.(x-4)=123-38
5.(x-4)=85
x-4=85:5
x-4=17
x=17+4
x=21
Đúng 1000000000000000
a) 124+(118-x)=215
124+118-x=215
242- x=215
x=242-215
x=27
b)96-3(x-5)=57
96-3x+15=57
(96+15)-3x=57
111-3x=57
3x=111-57
3x=54
x=54/3
x=18
c)75*(3x-23)=74*72
3x-8 =76/75
3x-8 =7
3x =7+8
3x =15
x =15/3
x =5
d) [(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