Odpowiedź :
Odpowiedź:
zadanie 4.
a)
5x+4=10
5x = 10 - 4
5x= 6
x= 6 : 5
x = 1,2
spr.
5x+4=10
L = 5x + 4= 5 * 1,2 + 4 = 6 ++ 4= 10
P= 10
10 = 10
L=P
b)
3x-5= 9
3x = 9 + 5
3x = 14
x = 14 : 3
x = 14/3
x = 4 i 2/3
spr.
3x-5= 9
L = 3x - 5 = 3* 4 i 2/3 - 5 = 3 * 14/3 - 5 = 1 * 14/1 - 5 = 14 - 5 = 9
P = 9
9 = 9
L = P
c)
-2x + 3 = 7
- 2x = 7 - 3
- 2x = 4
x = 4 : (-2)
x = - 2
spr.
-2x + 3 = 7
L = - 2x + 3 = -2*(-2) + 3 = 4 + 3 = 7
P = 7
7 = 7
L = P
d)
-4x-3= 13
-4x = 13 + 3
-4x = 16
x = 16 : (-4)
x = - 4
spr.
-4x-3= 13
L = -4x - 3 = -4*(-4) - 3 = 16 - 3 = 13
P = 13
13 = 13
L = P
zadanie 5.
a)
x+8
-------- = 20 I *5
5
x + 8 = 100 / - 8
x = 92
b)
x - 6
--------- = 4 /*2
2
x - 6 = 8 /+6
x = 14
c)
x + 1
--------- = - 2 /*3
3
x + 1 = - 6 /- 1
x = - 7
Szczegółowe wyjaśnienie: