Question

dau coroana!
REZOLVAȚI ECUAȚIILE:
A) (13:x-1)•13=0
B) [(3x-2)•5-1]:2+5=7
C) [(3x+8):17-1]•222+9=9
D) {[(6-x)•2-7]•9-5}:2=2

Answer 1

a)
(13:x-1)•13=0
13:x-1 = 0:13
13:X-1 = 0
13:X = 0+1
13:X = 1
X = 13:1
X = 13

b)
[(3x-2)•5-1]:2+5=7
[(3x-2)•5-1]:2 = 7-5
[(3x-2)•5-1]:2 = 2
(3x-2)•5-1 = 2×2
(3x-2)•5-1 = 4
(3x-2)•5 = 4+1
(3x-2)•5 = 5
3x-2 = 5:5
3X-2 = 1
3X = 1+2
3X= 3
X = 3:3
X = 1

c)

[(3x+8):17-1]•222+9=9
[(3x+8):17-1]•222 = 9-9
[(3x+8):17-1]•222 = 0
(3x+8):17-1 = 0:222
(3x+8):17-1 = 0
(3x+8):17 = 0+1
(3x+8):17 = 1
3x+8 = 1×17
3X+8 = 17
3X = 17-8
3X= 9
X = 9:3
X = 3

d)
{[(6-x)•2-7]•9-5}:2=2
[(6-x)•2-7]•9-5 = 2×2
[(6-x)•2-7]•9-5 = 4
[(6-x)•2-7]•9 = 4+5
[(6-x)•2-7]•9 = 9
(6-x)•2-7 = 9:9
(6-x)•2-7 = 1
(6-x)•2 = 1+7
(6-x)•2 = 8
6-X = 8:2
6-X = 4
X = 6-4
X = 2