Odpowiedzi

2010-04-14T21:58:13+02:00
A) -7b = ⅞ |:-7
b= -0,125

b) 7x + 7 = 35
7x= -7+35
7x= 28 |:7
x= 4

c) 2 - x = 5 - 2x
-x+2x= -2 +5
-x= 3 |:(-1)
x=-3

d) 69 - x = x + 96
-x-x= -69 +96
-2x= 27 |:(-2)
x =- 13,5
lub
x= - 27/2
x= - 13 1/2

e) ½x + 5 = x + 8
½x - x= -5 +8
-0,5x = 3 |: -(0,5)
x= -6

Liczę na naj ;-*
2010-04-14T22:14:53+02:00
A)
-7b = ⅞
b=⅞ :7
b=⅞ *1/7
b=1/8
b)
7x + 7 = 35
7x=35-7
7x=28
x=4
c)
2 - x = 5 - 2x
-x+2x=5-2
x=3
d)
69 - x = x + 96
-x-x=96-69
-2x=27
x= -27/2
x= -13 i1/2
e)
½x + 5 = x + 8
½x-x=8-5
- ½x= 3
x= 3: (- ½)
x=3*(-2)
x= -6