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125 x 3x - 3 = 375
=> 3x - 3 = 375 : 125
=> 3x - 3 = 3
=> 3x - 3 = 31
=> x - 3 = 1
=> x = 1 + 3
=> x = 4
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a)5x-2 - 32 = 24 - ( 28 * 24- 210 * 22 )
=> 5x-2-32=16
=> 5x-2=25
=> (5x)2=25
=> 5x=5
=> x=1
b) ( 3 * x - 24 ) * 73 = 8 * 74
=> (3.x-16)=8.74:73
=> 3x-16=56
=> 3x=72
=> x=24
c) x15 = x
=> x15:x=1
=> x14=1
=> x=1
d) ( x - 5 )4 =( x - 5 )6
=> (x-5)6:(x-5)4=1
=> (x-5)2=1
=> x-5=1
=> x=6
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Câu 2:
(8^7)/(2^18)
=(2^21)/(2^18)
=2^3=8 không chia hết cho 14 nhé
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a) 5.5x.5x + 5 = 56
52x + 6 = 6
2x + 6 = 6
x = 0
b) 8x + 3.8x - 2 = 16 : 2
82x + 1 = 8
2x + 1 = 1
x = 0
c) 7x + 1.7x + 2.7x + 3 = 78 - 3x
73x + 6 = 78 - 3x
3x + 6 = 8 - 3x
x = \(\frac{1}{3}\)
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4x-1-7=34:32
4x-1-7=32
4x-1-7=9
4x-1=9+7
4x-1=16
4x-1=42
4x=42+1
4x=43
vậy x=3
Giải:
4x-1-7=34:32
<=>4x-1-7=9
<=>4x-1=9+7
<=>4x-1=16=42
<=>x-1=2
<=>x=2+1=3
Vậy x=3
Chúc bạn học tốt !
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1/ 3(x - 2) = 9 => x - 2 = 3 => x = 5
2/ 3(x - 36) = 216 => x - 36 = 72 => x = 108
3/ (x - 3)3 = 33 => x - 3 = 3 => x = 6
4/ 2x = 32 => 2x = 25 => x = 5
5/ 3x - 16 = 2.74 : 73 = 14 => 3x = 30 => x = 10
6/ (6x - 39) : 3 = 201 => 6x - 39 = 603 => 6x = 642 => x = 107
7/ (3x - 15)2 = 81 => (3x - 15)2 = 92 => 3x - 15 = 9 => 3x = 24 => x = 8
8/ 3(x + 4) = 105 => x + 4 = 35 => x = 31
9/ 12x - 43 = 4.84 : 83 = 32 => 12x = 32 : 64 => 12x = 1/2 => x = 1/24
10/ 41 - (2x - 5) = 680 => 2x - 5 = -639 => 2x = -634 => x = - 317
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\(\left(x+1\right)^7=4^2.8^3\Leftrightarrow\left(x+1\right)^7=2^{13}\Leftrightarrow x+1=2^6\Leftrightarrow x=2^6-1=64-1=63\)