Odpowiedzi

2010-03-09T16:39:27+01:00
1)
¾(2-3x) = -6
1,5-2,25x=-6
-2,25x=-6-1,5
-2,25x=-7,5
x=3⅓

2)
⅕ (x-3)=9-x
⅕x-⅗=9-x
⅕x+x=9+⅗
1⅕x=9⅗
x=8
2010-03-09T16:43:42+01:00
3/4 ( 2- 3x)= 6
6/4 - 9/4x= 6 :( - 3/2)
- 9/2x= 9/2 * 4
-9x= 18 : (- 9)
x=2




1/3z - 1= 9-x +1
1/3 x= 10 - x *3
x= 30 - x +x
2x= 30 :2
x=15