\(a,12\left(x-1\right)=0\\ x-1=0\\ x=1\\ b,45+5\left(x-3\right)=70\\ 5\left(x-3\right)=25\\ x-3=5\\ x=8\\ c,3.x-18:2=12\\ 3.x-9=12\\ 3.x=21\\ x=7\)
12(x-1)=0
(x-1)=0:12
x-1=0
x=0+1
x= 1
Vậy x= 1
12 ( x - 1 ) = 0
x - 1 = 0 : 12
x - 1 = 0
=> x = 1
45+5(x-3)=70
5(x-3)=70-45
5(x-3)=25
x-3=25:5
x-3=5
x=5+3
x=8
Vậy x =8
45 + 5(x - 3) = 70
5(x - 3) = 70 - 45
5(x - 3) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
a) 12(x-1)=0
x-1= 0:12
x-1=0
x = 0+1
x = 1
Vậy x=1
b) 45+5(x-3)=70
5(x-3)=70-45
5(x-3)=25
x-3= 25:5
x-3= 5
x = 5+3
x = 8
Vậy x=8
c)3x-18:2=12
3x-9 = 12
3x = 12+9
3x = 21
x = 21:3
x = 7
Vậy x=7
Mấy cái dưới thì bình tĩnh, đi nấu cơm đã nhé, cảm ơn~~