a) x + (-25)=-12-(-4)
x -25 = -8
x =-8 +25
x =17
b) 2x + 5 = -3
2x =-3-5
2x =-8
x =-8:2=-4
d) 9(x + 7) -12 =24
9x + 63 =24 + 12
9x +63 =36
9x =36 -63
x =-27 : 9 =-3
nhớ tk cho mình nha
a. x+(-25) = -12-(-4)
x-25 = -12+4
x-25 = -8
x = -8+25
x = 17
b. 2x+5 = -3
2x = -3+5
2x = 2
x = 1
c. |x-7|+5 = 12
|x-7| = 12-5
|x-7| = 7
x-7 = 7 => x = 14
x-7 = -7 => x = 0
d. 9(x+7)-12 = 24
9(x+7) = 24+12
9(x+7) = 36
(x+7) = 4
x = 4-7
x = -3
x+(-25)=-12-(-4)
=>x+(-25)=-12+4
=>x+(-25)=-8
=>x=-8-(25)
=>x=-8+25
=>x=17
vậy x =17
b.2x+5=-3
=>2x=-3+5
=>2x=2
=>x=1
vậy x=1
c.|x-7|+5=12
=>|x+7|=12-5=7
=> x+7 = 7 hoặc -7
=>x=0 hoặc -14
vậy ...
d.9(x+7)-12=24
=>9(x+7)=24+12=36
=>x+7=36:9
=>x+7=4
=>x=4-7
=>x=-3
vậy x=-3
knha
a)x+(-25)+-12-(-4)
=>x+(-25)=-12+4
=>x+(-25)=-8
=>x=-8-(-25)
=>x=-8+25
=>x=17
b)2x+5=-3
=>2x=-3-5
=>2x=-8
=>x=-8:2
=>x=-4
c) |x-7|+5=12
=>|x-7|=12-5
=>|x-7|=7
=>x-7=7
x-7=-7
=>x=7+7=14
x=(-7)+7=0
X thuộc {14:0}
d) 9(x+7)-12=24
=>9(x+7)=24+12
=>9(x+7)=36
=>x+7=36:9
=>x+7=4
=>x=4-7
=>x=-3