zad.10
a ) 2 • ( x + 4 ) + 6x = 8
2x + 8 + 6x = 8
x = 0
b) 5x - 2( x + 4 ) = 10
5x - 2x - 8 = 10
3x - 8 = 10
3x = 18
x = 6
c ) -4 + 4 ( 2 - 5x ) = 9
- 4 + 8 - 20x = 9
4 - 20x = 9
-20x = 5
x = 0,25
zad. 11
a ) x + 3 = 2 • x
x = 3
b) x • 3 = 16 + x
x = 8
c) x • 4 - 20 = 8
x = 7
zad.12
a )
b = 2x + 1
a = x + 5
h = x
Ob = a • h / 2
Ob = 30
a × h = 60
b )
a = x + 4
Ob = a • h / 2
Ob = 30
a • h = 60
No w 12 tylko tyle mogę pomóc :(( , ale reszta będzie dobrze.
