Odpowiedzi

2010-04-08T16:44:29+02:00
A)-4(5-6z)-9(3z-2)=
-20+24z-27z+18=
-2-3z
b)5(4x+3)=2(9x-1)-3(2x+1)+4
20x+15= 18x-2-6x-3+4
20x+15= 12x-1
8x=-13 /8
x= -1,625
c)-7(3x+5)-4(-2+x)=3(6x-1)+3(-x-1)
-21x-35+8-4x = 18x-3-3x-3
-25x-27 = 15x -6
- 40x = 21 /-40
x = -0.525
d)-[-9+2(1-2x)+(4x-3)]=5x-1
-[-9+2-4x+4x-3]= 5x-1
9-2+4x-4x+3=5x-1
10=5x-1
11=5x /5
x = 2,2
e) x+3 =x-4
x-x =-4-3
0 =-7
Równanie sprzeczne