Odpowiedzi

2009-11-19T18:04:17+01:00
1.
(x+2)/9 + x-10/3 = 1
(x+2)/9 = 1 - (x-10)/3
(x+2)/9= 3/3 - (x-10)/3
(x+2)/9 = 3-(x-10)/3
(x+2)/9 = (3-x+10)/3
(x+2)/9 = (13-x)/3
3(x+2)=9(13-x)
3x+6=117-9x
12x=111 |÷12
x=9,25

2.
3x-5/2 = 5x-1/10
10(3x-5)=2(5x-1)
30x-50=10x-2
20x=48 |÷20
x=2,4