Odpowiedzi

2010-03-18T17:28:52+01:00
A) -( 2x -1)= 4
2x+1=4
2x=4-1
2x=3 |:2
x=3/2
b) 2( x + 1) = x
2x+2=x
2x-x=2
x=2
c) 2t - (3t + 1) = 6
6t-2t=6
4t=6 |:4
t=6/4, czyli 1,5
d) -(4 + x) = 2(3 - x)
4-x=6-2x
4-6=-2x+x
-2=-x |:-1
x=2
e) 3(y + 6) - y = 2(y + 9)
3y+12-y=2y+18
2y-2y=18-12
y=6
f) (x - 7) - 2(3 + 5) = 3
x-7-6-10=3
x=26