Odpowiedź :
Odpowiedź:
1) x - 4 = 17
x = 17 + 4
x = 21
2) 5x = 60 /:5
x = 12
3) -3x = 24 /:(-3)
x = -8
4) x : (-9) = -2 /·(-9)
x = 18
5) x + 1,3 = 2,7 /-1,3
x = 1,4
6) 5x + 13 = 23
5x = 10
x = 2
7) -x - 2 = -11
-x = -9
(x = 9)
8) -2x - 7 = 15
-2x = 15 + 7
-2x = 22
x = -11
9) 2(x + 3) = 10
2x + 6 = 10
2x = 4
x = 2
10) 5 -2(x + 2) = 9
5 - 2x = 9
2x = 4
x = 2
11) -2(5x + 2) = 3 - 9x
-21x = 3 - 9x
-12x = 3
x = -4
12) 16x - (4x + 5) = 2(x - 2) - 12
-64x + (-80) = 2x -12
-64x = 2x - 12 + 80
-66x = 68
x = 66/68 (ułamek)
13) 1:7x - 5 : 7 = 2
1 : 7x :7 = -3
7x : 7 = -4
7x = -28
x = -4
14) x : 4 - 3 : 8 = 1 : 2
x : 4 : 8 = 1 : 5
x : 4 = 1 : 5 : 8
x = 1 : 5 : 8 : 4
x = 1 : 5 : 2
x = 1 : 2,5
x = 0,4
1)x-4=17
x=21
2)5x=60
x=60/5
x=12
3)-3x=24
x=24/-3
x=-8
4)x/-9=-2
x=-2(-9)
x=18
5)x + 1,3 = 2,7
x=2.7-1.3
6)5x + 13 = 23
5x=23-13
5x=10
x=2
7)–x – 2 = -11
-x=-11+2
-x=-9
x=9
8)-2x – 7 = 15
-2x=15+7
-2x=22
x=22/-2
x=-11
9)2(x + 3) = 10
x+3=10/2
x+3=5
x=5-3
x=2
10)5 – 2(x + 2) = 9
5-2x-4=9
1-2x=9
-2x=9-1
-2x=8
x=8/-2
x=-4
11)-2(5x + 2) = 3 – 9x
-10x-4=3-9x
-10x-4+9x=3
-x-4=3
-x=3+4
-x=7
x=-7
12)16x – (4x + 5) = 2(x – 2) – 12
16x-4x-5=2(x-2)-12
12x-5=2(x-2)-12
12x-5=2x-4-12
12x-5=2x-16
12x-5-2x=-16
10x-5=-16
10x=-16+5
10x=-11
x=-11/10
x=--11/--10
13) 1/7x-5/7=2
1/7x=2+5/7
1/7x=14/7+5/7
1/7x=14+5/7
1/7x=19/7
x=19/7×7
x=19
14) x/4-3/8=1/2
2x-3=4
2x=4+3
2x=7
x=7/2