a)x+12=-25
x= (-25) -12
x= -37. Vậy x= -37
b) 30 : ( x -7 ) = 159 : 158
30 : (x-7) = 15
x - 7 = 30 : 15
x - 7= 2
x= 2+7
x = 9. Vậy x= 9
\(a,x+12=-25\)
\(x=-25-12\)
\(x=-37\)
\(b,30:\left(x-7\right)=15^9:15^8\)
\(30:\left(x-7\right)=15\)
\(x-7=30:15=2\)
\(x=2+7=9\)
a) x + 12 = - 25
x = - 25 - 12
x = - 37
b) 30 : ( x - 7 ) = 159 : 158
30 : ( x - 7 ) = 15
x - 7 = 30 : 15
x - 7 = 2
x = 7 + 2
x = 9
a, x + 12 = -25
x = ( - 25 ) -12
x = -37
Vay x = -37
b, 30 : (x-7) = 159 : 158
30 : (x-7) = 15
x-7 =30:15
x-7 = 2
x = 2 + 7 = 9
Vay x = 9
a)
x + 12 = -25
=> x = -25 - 12
=> x = -37
Vậy x = -37
b)
30 : (x - 7) = 159 : 158
=> 30 : (x - 7) = 15
=> x - 7 = 30 : 15
=> x - 7 = 2
=> x = 2 + 7
=> x = 9
Vậy x = 9
a) x+12=-25
x=-25-12
x=-25+(-12)
x=-37
b)30:(x-7)=15^9:15^8
30:(x-7)=15^9-8
30:(x-7)=15^1=15
x-7=30:15
x-7=15
x=7+15
x=22