2 . ( x - 51 ) = 2 . 23 + 20
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(20 - x) : 3 + 40 = 46
(20 - x) : 3 = 46 - 40
(20 - x) : 3 = 6
(20 - x) = 6 x 3
20 - x = 18
x = 20 - 18
x = 2
#Phương
(20 - x) : 3 + 40 = 46
(20 - x) : 3 = 46 - 40
(20 - x) :3 = 4
20 - x = 4 . 3
20 - x = 12
x = 20 - 12
x = 8
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Câu h:
1230 : 3(x - 20) = 10
3(x - 20) = 1230 : 10
3(x -20) = 123
x - 20 = 123 : 3
x - 20 = 41
x = 41 + 20
x = 61
#Phương
Bài 2 :
a ) 15 : ( x + 2 ) = 3
x + 2 = 15 : 3
x + 2 = 5
x = 3
Vậy x = 3
b ) 20 : ( x + 1 ) = 2
x + 1 = 20 : 2
x + 1 = 10
x = 9
Vậy x = 9
c ) 240 : ( x - 5 ) = 22 . 52 - 20
240 : ( x - 5 ) = ( 2 . 5 )2 - 20
240 : ( x - 5 ) = 102 - 20
240 ; ( x - 5 ) = 100 - 20
240 : ( x - 5 ) = 80
x - 5 = 240 : 80'
x - 5 = 3
x = 8
Vậy x = 8
d ) 96 - 3 . ( x + 1 ) = 42
3.( x + 1 ) = 96 - 42
3 . ( x + 1 ) = 54
x + 1 = 54 : 3
x + 1 = 18
x = 17
Vậy x = 17
e ) 5. ( x + 35 ) = 515
x + 35 = 515 : 5
x + 35 = 103
x = 103 - 35
x = 68
Vậy x = 68
f ) 12x - 33 = 32 . 33
12x - 33 = 35
12x - 33 = 243
12x = 243 + 33
12x = 276
x = 23
Vậy x = 23
g ) 541 - ( 218 + x ) = 73
218 + x = 541 - 73
218 + x = 468
x = 468 - 218
x = 250
Vậy x = 250
h ) 1230 : 3. ( x - 20 ) = 10
3 . ( x - 20 ) = 1230 : 10
3. ( x - 20 ) = 123
x - 20 = 369
x = 389
Vậy x = 389
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\(2.\left(x-51\right)=2.2^3+20\)
\(2.\left(x-51\right)=2.8+20\)
\(2.\left(x-51\right)=16+20\)
\(2.\left(x-51\right)=36\)
\(\left(x-51\right)=36\div2\)
\(x-51=18\)
\(x=18+51\)
\(x=69\)
2.(x-51)=36
x-51=36:2=18
x=18+51=69