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Question

Bài 5: Tìm x ∈ Z biết :a) (-x+31) - 39=-69;b) - 121 - (-35-x)=50c) 17+x-(352 -400)=-32d) 2130 - (x+130)+72=-64Giúp mk vs ạ,hứa tick

⭐Hannie⭐ · Accepted Answer

$ (-x+31) - 39=-69$$ -x+31 =-69+39$$-x+31 = -30$$-x = -30-31$$-x= -61$$=>x=61$$------------------$$ - 121 - (-35-x)=50$$ -35-x=- 121 -50$$ -35-x= -171$$x= -35- (-171)$$x= 136$$-----------------$$17+x-(352 -400)=-32$$17+x-(-48)=-32$$17+x=-32+(-48)$$17+x= -80$$x=-80-17$$x= -97$$----------------$$2130 - (x+130)+72=-64$$ 2130 - (x+130)=-64-72$$ 2130 - (x+130)= -136$$ x+130= 2130 -( -136)$$x+130= 2266$$x=2266-130$$x= 2136$Câu trả lời: $ (-x+31) - 39=-69$$ -x+31 =-69+39$$-x+31 = -30$$-x = -30-31$$-x= -61$$=>x=61$$------------------$$ - 121 - (-35-x)=50$$ -35-x=- 121 -50$$ -35-x= -171$$x= -35- (-171)$$x= 136$$-----------------$$17+x-(352 -400)=-32$$17+x-(-48)=-32$$17+x=-32+(-48)$$17+x= -80$$x=-80-17$$x= -97$$----------------$$2130 - (x+130)+72=-64$$ 2130 - (x+130)=-64-72$$ 2130 - (x+130)= -136$$ x+130= 2130 -( -136)$$x+130= 2266$$x=2266-130$$x= 2136$

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