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\(a,\left(2600+6400\right)-3\times x=1200\)
\(9000-3\times x=1200\)
\(3\times x=9000-1200\)
\(3\times x=7800\)
\(x=7800:3\)
\(x=2600\)
\(b,\left[\left(6\times x-72\right):2-84\right]\times28=5628\)
\(\left(6\times x-72\right):2-84=5628:28\)
\(\left(6\times x-72\right):2-84=201\)
\(\left(6\times x-72\right):2=201+84\)
\(\left(6\times x-72\right):2=285\)
\(6\times x-72=285\times2\)
\(6\times x-72=570\)
\(6\times x=570+72\)
\(6\times x=642\)
\(x=107\)
\(c,2x-138=2^3:3^2\)
\(2x-138=\frac{8}{9}\)
\(2x=\frac{8}{9}+138\)
\(2x=\frac{1250}{9}\)
\(x=\frac{1250}{9}:2\)
\(x=\frac{625}{9}\)
\(d,42x=39\times42-37\times42\)
\(42x=42\times\left(39-37\right)\)
\(42x=42\times2\)
\(42x=84\)
\(x=2\)
a) ( 2600 + 6400 ) - 3 . x = 1200
9000 - 3 . x = 1200
3 . x = 9000 - 1200
3 . x = 7800
x = 7800 : 3
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 ) = 285 . 2
( 6 . x - 72 ) = 570
6 . x = 570 + 72
6 . x = 642
x = 642 : 6
x = 107
c) 2 . x - 138 = 23 . 32
2 . x - 138 = 8 . 9
2 . x - 138 = 72
2 . x = 72 + 138
2 . x = 210
x = 210 : 2
x = 105
d, 42 . x = 39 . 42 - 37 . 42
42 . x = 42 . ( 39 - 37 )
42 . x = 42 . 2
\(\Rightarrow\) x = 2
a)\(2x-138=3^2.2^3\)
\(2x-138=72\)
\(x=105\)
b)\(x=2^4+3^2.3^2\)
\(x=16+81\\ x=97\)
c)\(6x-39=\frac{588}{28}\\ 6x-39=21\\ x=10\)
a) (2600 + 6400) - 3.x = 1200 c)2x-138=2^3 . 3^2
9000 - 3.x=1200 2x-138=8.9
3.x=9000-1200 2x-138=72
3.x=7800 2x=72+138
x=7800:3 2x=210
x=2600 x=210:2
b) [(6x-72):2-84].28=5628 x=105
[(6x-72):2-84]=5628:28 d)42x = 39.42-37.42
(6x-72):2-84=201 42x = (39-37).42
(6x-72):2=201+84 42x = 2.42
(6x-72):2=285 42x=84
6x-72=285.2 x=84:42
6x-72=570 x=2
6x=570+72
6x=642
x=642:6
x=107
a.(2600+6400)-3.x=1200
9000-3.x=1200
3.x=9000-1200
3.x=7800
x=7800/3
x=2600
Vậy 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=285.2
6.x-72=570
6.x=570+72
6.x=642
x=642:6
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) 9000 - 3 . x=1200
3.x =9000 - 1200
3.x =7800
x =7800:3
x=2600
b) [(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
c) (3. x - 2^4) = 2. 7^4 : 7^3
(3. x - 16) = 2. 7
3. x - 16 = 14
3. x = 14 + 16
3. x = 30
x = 30 : 3
x = 10
a) (2600+6400) - 3. x = 1200
9000-3.x=1200
3.x=9000-1200
3.x=7800
x=7800:3
x=2600
b) [(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) =285x2
6x - 72 =570
6x =570+72
6x =642
x =642:6
x =107
c) (3. x - 24) . 73= 2. 74
tí nk làm,mà bài này dễ bạn tự suy nghĩ đi,tính lũy thừa trước nà
1,x=-2600
2,x=2
3,x=105
1:(2600+6400)-3x=1200
=9000-3x=1200
3x=9000-1200
3x=7800
x=7800:3
x=2600
2:42x=39x42-37x42
42x=42x(39-37)
42x=42x2
42x=84
x=84:42
x=2
2x-138=2^3x3^2
2x-138=8x9
2x-138=72
2x=72+138
2x=210
x=210:2
x=105
(Giải đầy đủ nhé)