Question

[Nguyễn Thanh Hằng]

Bài 3. Tìm số nguyên x biết:

a) 𝑥−(−7)=0

b) 18−𝑥=−8−(−13)

c) 𝑥+29=|−43|+(−43)

d) 15−|𝑥|=10

e) |10−𝑥|−17=−7

Answer 1

[Thúy Vy]

a) 𝑥−(−7)=0

x+7=0

x=0-7

x=-7

b) 18−𝑥=−8−(−13)

18-x=-8+13

18-x=5

x=18-5

x=13

c) 𝑥+29=|−43|+(−43)

TH1

𝑥+29=|−43|+(−43)

𝑥+29=43-43

x+29=0

x=0-29

x=-29

TH2

𝑥+29=−43+(−43)

x+29=-43-43

x+29=-86

x=-86-29

x=-115

d) 15−|𝑥|=10

|𝑥|=15-10

|𝑥|=5

vậy x=5 hoặc x=-5

e) |10−𝑥|−17=−7

|10−𝑥|=-7+17

|10−𝑥|=10

TH1:

10-x=10

x=10-10

x=0

TH2:

10−𝑥=-10

x=10+10

x=20