Bài 1: Tìm số nguyên x biết: a) 16-x = 21- (-8) b) x-32 = (-5) -17 c)47-( x+15)=21 d) -5-(24-x) = -11 e) 13. (x-5)= -169 f) 2. (4-x)= -8

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1. a) 16-x=21-(-8)

   16-x=29

   x=16-29

   =>x=-13

    b)x-32 = (-5) -17

   ????−32=−22

   x= -22+32

   =>x=10

   c)47-( x+15)=21

   47−????−15=21

   32−????=21

   => x= 11

   d)-5-(24-x) = -11

   -5-24-x=-11

   -29-x=11

   =>x=-18

   e) 13. (x-5)= -169

   13????−65=−169

   13x=-104

   => x=-8

   f) 2. (4-x)= -8

   −2????+8=−8

   −2????=-16

   =x=8

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2. `a)16-x=21-(-8)`

   $=>16-x=21+8$

   $=>16-x=29$

   $=>x=16-29$

   $=>x=-13$

   $b)x-32=(-5)-17$

   $=>x-32=-22$

   $=>x=-22+32)$

   $=>x=10$

   $c)47-(x+15)=21$

   $=>x+15=47-21$

   $=>x+15=26$

   $=>x=26-15$

   $=>x=11$

   $d)-5-(24-x)=-11$

   $=>24-x=-5-(-11)$

   $=>24-x=6$

   $=>x=24-6$

   $=>x=18$

   $e)13.(x-5)=-169$

   $=>x-5=-169:13$

   $=>x-5=-13$

   $=>x=-13+5$

   $=>x=-8$

   $f)2.(4-x)=-8$

   $=>4-x=-8:2$

   $=>4-x=-4$

   $=>x=4-(-4)$

   $=>x=4+4$

   $=>x=8$

    

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