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a ) x ∈ ± 23 28 . b ) x ∈ − 23 6 ; 35 6 . c ) x ∈ − 17 60 ; 97 60 . d ) x ∈ 67 140 ; 143 140 .
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a/ M = (71+x)-(-24+x)+(-35-x) = 71 + x + 24 - x - 35 - x = (71 + 24 - 35) - x = 95 - 35 - x = 60 - x
b/ N=x-34-[(15+x)-(23-x)] = x - 34 - (15 + x - 23 + x) = x - 34 - (-8 + 2x) = x - 34 + 8 - 2x = -26 - x
\(a,M=\left(71+x\right)-\left(-24+x\right)+\left(-35-x\right)\)
\(=71+x+24-x-35-x\)
\(=60-x\)
\(b,N=x-34-\left[\left(15+x\right)-\left(23-x\right)\right]\)
\(=x-34-\left(15+x-23+x\right)\)
\(=x-34-15-x+23-x\)
\(=-26-x\)
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x-34-[(15+x)-(23-x)]=15-21
x-34-[(15+x)-(23-x)]= -6
x-34-15-x-23+x = -6
(x-x+x) + (-34-15-23)= -6
x + -72 = -6
x = -6-(-72)
x =66
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a) x − 2 3 = − − 1 5 + 3 4 ⇔ x − 2 3 = − 1 5 + 3 4 = 11 20 ⇔ x − 2 3 = 11 20 x − 2 3 = − 11 20 ⇔ x = 73 60 x = 7 60
b) x − 3 = 1 5 + 1 7 − 1 14 ⇔ x − 3 = 1 5 + 1 14 = 19 70 ⇔ x − 3 = 19 70 x − 3 = − 19 70 ⇔ x = 229 70 x = 191 70
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(x-15) - (x-3) = -(x+17) - 1 <=> x-15-x+3 = -x-17-1 <=> x = -6
-(x-12) - (x-5) = -(4-x) + 13 <=> -x+12-x+5 = -4+x+13 <=> -3x = -8 => x = 8/3
34 - (x-7) = x+15 - (x+23) <=> 34-x+7 = x+15-x-23 <=> -x = -49 <=> x = 49
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mk chỉ làm ý A thui nha
\(A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)
\(A=71+x+24+x+\left(-35\right)-x\)
\(A=\left[71+24+\left(-35\right)\right]+\left(x+x-x\right)\)
\(A=60+x\)
Vậy \(A=60+x\)
\(a,A=\left(71+x\right)-\left(-24-x\right)+\left(-35-x\right)\)
\(=71+x+24+x-35-x\)
\(=60+x\)
\(b,B=x-34-\left[\left(15+x\right)-\left(23-x\right)\right]\)
\(=x-34-\left(15+x-23+x\right)\)
\(=x-34-15-x+23-x\)
\(=-x-26\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. M=71+x+21+x-35-x
M=57+x
b. N=x-34-(15+x-23+x)
N=x-34-38-2x
N=-72-x
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a) ( 71 + x ) - ( -24 - x ) + ( -35 - x )
= 71 + x + 24 + x - 35 - x
= ( 71 + 24 - 35 ) + ( x + x - x )
= 60 + x
b) x - 34 - [( 15 + x ) - ( 23 - x )]
= x - 34 - ( 15 + x - 23 + x )
= x - 34 - ( 15 - 23 + x2 )
= x - 34 - ( - 8 + 2x )
= x - 34 + 8 - 2x
= x - 2x + 8 - 34
= -x - 26
c) ( -15 + |x| ) + ( -25 - |x| )
= -15 + |x| - 25 + |x|
= -15 - 25 + x + x
= -40 + x2
a)(71+x)-(-24-x)+(-35-x)
=>71+x+24+x-35-x
=>60+x
b)x-34-[(15+x)-(23-x)]
=>x-34-(15+x-23+x)
=>x-34-15-x+23-x
=-x-26
N = x - 34 - [(15 + x) - (23 - x)]
= x - 34 - (15 + x - 23 + x)
= x - 34 - (2x - 8)
= x - 34 - 2x + 8
= -x - 26