Odpowiedź:
8*x+3= 90
8x = 90 - 3
8x = 87
x= 87 : 8
x= 87/8
x= 10 i 7/8
spr.
8*x+3= 90
L= 8x + 3 = 8 * 10 i 7/8 + 3 = 8 * 87/8 + 3 = 1 * 87/1 + 3 = 87 + 3= 90
P= 90
90=90
L=P
5*s-9= -6
5s = - 6 + 9
5s = 3
x= 3 : 5
x = 0,6
spr.
5*s-9= -6
L= 5s - 9 = 5*0,6 - 9 = 3 - 9 = - 6
P= - 6
-6=-6
L=P
7-2*x= 15
- 2x = 15 - 7
- 2x = 8
x= 8 : (-2)
x= - 4
spr.
7-2*x= 15
L= 7 - 2x = 7 - 2(-4) = 7 - (-8) = 7 + 8 = 15
P= 15
15=15
L=P
5*k+3= 33
5k = 33 -3
5k = 30
k = 30 : 5
k = 6
spr.
5*k+3= 33
L= 5k + 3= 5 * 6 + 3= 30 + 3 = 33
P= 33
33=33
L=P
Szczegółowe wyjaśnienie:
