Odpowiedzi

2010-04-13T19:16:59+02:00
- 7b = 7/8
- 7b razy 8 = 7
- 56b = 7
b = - 7/56 = - 1/8
1/2 + 5 = x + 8
1 + 10 = 2x + 16
2x = 1 + 10 - 16 = - 5
x = - 5/2 = - 2 i 1/2
2010-04-13T19:18:08+02:00
A)
-7b=7/8 /:(-7)
b=-1/8

b)
1/2 + 5=x+8
-x=-1/2-5+8
-x=2 1/2 /:(-1)
x=2 1/2
2010-04-13T19:18:49+02:00
A) -7b=7/8 ] x8
-56b=7
b= 7:(-56)= -0,125

b) x+8=1/2+5 ]x2
2x+16=1+10
2x+16=11 ]-16
2x=-5
x= -5:2= -2,5