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a) -2x - (x-17) = 34-(-x + 25)
-2x- x+17= 34+x-25
-2x-x-x= -17 +34-25
-4x = -8
x = 2
b)17x-(-16x-27) = 2x+43
17x + 16x + 27 = 2x + 43
17x + 16x -2x= -27 +43
31x= 26
x= 21/31
c)- 2x- 3(x-17) = 34- 2(-x + 25)
-2x - 3x + 51 = 34 + 2x -50
-2x - 3x -2x = -51 + 34 -50
-7x = -67
x = 67/7
d) 17x +3(-16x-37) = 2x+ 43 -4x
17x -48x -111 = 2x + 43 -4x
17x - 48x -2x + 4x = 111 -43
-29x = 68
x = -68/29
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a) 6x - 35 + 5x - 21 = (6x + 5x) - (35 + 21) = 11x - 56 = 17x - 20 => 11x = 17x - 20 + 56 = 17x + 36
=> 36 = 11x - 17x = -6x => x = 36 : (-6) = -6
b) 5x + 35 - 4x - 27 = (5x - 4x) + (35 - 27) = x + 8 = 14x + 34 => x = 14x + 34 - 8 = 14x + 26
=> 26 = x - 14x = -13x => x = 26 : (-13) = -2
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49 (6x-12 ) = 0 17 (15x-45) =0 105 ( 17x-34 ) = 0 57 ( 9x -27 ) = 0
6x -12 = 0 15x -45 = 0 17x - 34 = 0 9x - 27 = 0
6x = 12 15x = 45 17x = 34 9x = 27
x = 2 x =3 x = 2 x = 3
25 + ( 15 - x ) =30 3 ( x + 7 ) -15 =27
15 - x = 25 3 ( x + 7 ) = 42 ( k cho mình nhé )
x = -10 x + 7 = 14
x = 7
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\(c)\) \(C=\frac{\frac{2}{7}+\frac{2}{5}+\frac{2}{17}-\frac{2}{293}}{\frac{3}{7}+\frac{3}{5}+\frac{3}{17}-\frac{3}{293}}\)
\(C=\frac{2\left(\frac{1}{7}+\frac{1}{5}+\frac{1}{17}-\frac{1}{293}\right)}{3\left(\frac{1}{7}+\frac{1}{5}+\frac{1}{17}-\frac{1}{193}\right)}\)
\(C=\frac{2}{3}\)
Bạn Cô nàng Thiên Bình làm đúng hết òi =.=
a=7.[1/8+1/27-1/49]
------------------------
11.[1/8+1/27-1/49]
=7/11
cau b,c tuong tu nha h mk
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E = \(\left(16.64\right)^3.16^5.84^2\)
\(=16^3.64^3.16^5.84^2\)
\(=16^8.\left(4^3\right)^3.84^2\)
\(=4^{16}.4^9.7^2.12^2\)
\(=4^{16}.4^9.7^2.3^2.4^2\)
\(=4^{26}.49.9\)
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a) 612 - 256 : X = 589
256 : X = 612 - 589
256 : X = 23
X = 256 : 23
X = 256/23
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b) \(-17\times1011-17\times\left(-12\right)+17\times\left(-1\right)\)
\(=17\times\left(-1011\right)-17\times\left(-12\right)+17\times\left(-1\right)\)
\(=17\times\left[\left(-1011\right)-\left(-12\right)+\left(-1\right)\right]\)
\(=17\times\left(-1000\right)\)
\(=-17000\)
Chúc bạn học tốt
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=> (17x - 293) : 27 = 850 - 842 = 8
=> 17x = 8 + 293 = 301
=> x = 301 : 17 = 301/17
850-(17x-293):27=842
(17x-293):27=850-842
(17x-293):27=8
17x-293=8.27
17x-293=216
17x=216+293
17x=509
x=509:17
x=509/17
Đinh Tuấn Việt làm sao xuống hàng 2 mất số 27