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25 - ( 15 - x + 303) + 303 = 25 - 15 + (303 - 303) + x = x + 10
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C = (-15 + |x|) + (25 - |-x|)
= -15 + |x| + 25 - |-x|
= (25 - 15) + |x| - |-x|
= 10 + |x| - |-x|
Ta có: |x| = |-x| => |x| - |-x| = 0
=> C = 10 + |x|
C = (-15 + IxI ) + ( 25 - I-xI)
C = (-15 + x ) + ( 25 - x )
C = -15 + x + 25 - x
C = ( -15 + 25 ) + ( x - x )
C = 10 + 0
C = 10
Vậy C = 10
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A = ( 71 + x ) - ( -24 - x ) + ( -35 - x )
= 71 + x - ( -24 ) + x + ( -35 ) + x
= 71 - ( -24 ) + ( -35 ) + x . 3
= 60 + 3x
= 3 ( 20 + x )
B = x - 34 - [ ( 15 + x ) - ( 23 - x ) ]
= x - 34 - [ 15 + x - 23 + x ]
= x - 34 - ( 15 - 23 ) - 2x
= x - 34 - ( -8 ) - 2x
= x - 26 - 2x
= ( -x ) - 26
C ) tương tự
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a) 2x + (-61) - (21 - 61) = 2x - 21 + (61 - 61) = 2x - 21.
b) (- 3 - x + 5) + 3 = (- 3 + 3) + 5 - x = 5 - x.
c) 11- (13 - x) + (13 - 11) = (11- 11) + (13- 13) + x = x
d) 25 - ( 15 - x + 303) + 303 = 25 - 15 + (303 - 303) + x = x + 10
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A=(x-15)-[(57+x)-(23-x)]
=x-15-[57+x-23+x]
=x-15-[(57-23)+(x+x)]
=x-15-[34+2x]
=x-15-34-2x
=x-2x-(15+34)
=(-x)-49
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P = ( - 15 + | x | ) + ( 25 - | - x | )
P = ( - 15 + x ) + ( 25 - x )
P = - 15 + x + 25 - x
P = - 15 + 25 + x - x
P = 25 - 15 + 0
P = 10
P=(-15)+x+25-x
P=[(-15)+25]+(x-x)
P=10+0
P=10