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a) ( -2x - 28 )5 = -32 = ( -2 )5
-2x - 28 = -2
-2x = ( -2 ) + 28 = 26
x = 26 : ( -2 ) = -13
b) ( 7x - 11 )3 = 1000 = 103
7x - 11 = 10
7x = 10 + 11 = 21
x = 21 : 7 = 3
c) ( 3x - 15 )2 - 6 = 75
( 3x - 15 )2 = 75 + 6 = 81 = 92
3x - 15 = 9
3x = 9 + 15 = 24
x = 24 : 3 = 8
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a) tù 1-1000 có:1000 số
1+2+3+..1000=(1000+1).1000:2=500500
b)x+2x+3x+...+1000x=385/8
x(1+2+3+...+1000)=385/8
x.500500=385/8
x=1/10400
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(3x + 1)3 = 1000
(3x + 1)3 = 103
=> 3x + 1 = 10
3x = 9
x = 3
(2x - 1)3 = 27
(2x - 1)3 = 33
=> 2x - 1 = 3
2x = 4
x = 2
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= 1x4+ 2x4 + 3x4+.....+1000x4
=( 1+2+3+....+1000)x4
=500500x4
=2002000
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A=[1000-13].[1000-23]......[1000-103]....[1000-553]
A=[1000-13].[1000-23]....0........[1000-553]
A=0[ vi 1000-103=0 nha bn]
Vay....
\(\frac{3}{1000}+3x=\frac{2}{3}\)
\(3x=\frac{1991}{3000}\)
\(x=\frac{1991}{9000}\)
ko tính dc