a) -13 + x = 39
x = 39 - (-13)
x = 52
b) 3x - (-17) = 14
3x + 17 = 14
3x = 14 - 17
3x = -3
x = -3 : 3
x = -1
c) x + 9.2 = 10
x + 18 = 10
x = 10 - 18
x = -8
a.-13+x=39
x=39+13=52
b.3x-(-17)=14
3x+17=14
3x=14-17=-3
x=-3:3=-1
c.x+9.2=10
x+18=10
x=10-18=-8
a.-13+x=39
x=39-(-13)
x=39+13
x=52
Vậy,x=52
3x-(-17)=14
3x=14+(-17)
3x=-3
x=-3:3
x=-1
Vậy,x=-1
c.x+9.2=10
x+18=10
x=10-18
x=10+(-18)
x=-8
Vậy,x=-8
a. -13+x=39
x=39+13
x=52
b. 3x-(-17)=14
3x+17=14
3x=14-17
3x=-3
x=-3:3
x=-1
c. x+9.2=10
x+18=10
x=10-18
x=-8
a : 52 ; b : 1 ; c : -8
a) -13 + x = 39
=> x = 39 - (-13)
=> x = 52
b) 3x - (-17 ) =14
=>3x + 17 = 14
=> 3x = 14- 17
=>3x = -3
=>x=-1
c)x + 9 .2=10
=> x+18 = 10
=>x=10 - 18
=> x =-8
a,-13+x=39
x=39-(-13)
x=52
b,3x-(-17)=14
3x=14+(-17)
3x=-3
x=(-3):3
x=-1
c,x+9.2=10
x+18=10
x=10-18
x=-8
a)-13+x=39
x=39+13
x=25
b)3x-(-17)=14
3x+17=14
3x=14-17
3x=-3
x=-3:3
x=-1
c.x+9,2=10
x=10-9,2
x=0,8