Odpowiedź:
zad.2
a) 2x+1=19
2x = 19-1
2x =18 I :2
x=9
a) 2(x+3) + 4 = 12 + x
2x +6 + 4 = 12 + x
2x+x +10 = 12
3x = 12 -10
3x = 2 I : 3
x= 2/3
b) 7x + 12 = 4x +22
7x - 4x = 22-12
3x = 10 I : 3
x= 10/3
x= 3 i 1/3
c)5(x - 1/5) - 2 (3 +x) = 4x+6
5x - 1 - 6 -x = 4x +6
5x+ 4x - x= 6 +1 +6
8x=13 I : 8
x = 13/8
x= 1 i 5/8
zad.3
a) ab+c=1
ab = 1 -c
b= (1 - c) : a
b) P= 1/2 ·a·h
a = P · 2 : h
c) T = 2(t+m) I :2
1/2 T = t+m
m= 1/2 T - t
Szczegółowe wyjaśnienie:
