Odpowiedzi

Najlepsza Odpowiedź!
2009-12-12T21:19:57+01:00
A. 2(1/2x-25)=(6x-25)-5(x+5)
x-50=6x-25-5x-25
x-50=x-50
0=0

b. 6x – 3 = 2x + 5
6x – 2x = 5 + 3
4x = 8 /4
x = 2

c. b) ½x + 7 = 4 - x /* 2
2*½x + 2 * 7 = 3 *(4 – x)
x + 14 = 12 – 3x
x + 3x = 12 – 14
4x = -2 /4
x = -½

d. 3x – 7 = 3x + 4
3x – 3x = 4 + 7
0 = 13


e. 2(x + 1)+5 = 2x + 7
2x + 2 +5= 2x +7
2x – 2x = 7 – 7
0 = 0

f. 5(x + 1/5) = 5x – 5
5x + 1 = 5x – 5
5x – 5x = -5 – 1
0 = -6
2 5 2