Odpowiedzi

2010-04-08T14:46:29+02:00
A)
1/2y+3=7 /-3
1/2y=4 /*1/2
y=2

b)
3/5y+2/5=4
3/5y+2/5=20/5 /-2/5
y=18/5*5/3
y=6

c)
3(y+2) = 5
3y+6=5 /-6
3y=-1 /*1/3
y=-1/3

d)
7(y+3)=5y+2+2y
7y+21=7y+2 /-2
7y+19=7y /-7y
19=0
2010-04-08T14:47:26+02:00
A.) 1/2y+3=7 / -3
1/2y=4
y = 8
b) 3/5y+2/5=4 / x5
3y+2y=4
5y=4 / :5
y= 4/5
c) 3(y+2) = 5
3y+6=5 / -6
3y=-1 / :3
y=-1/3
d) 7(y+3)=5y+2+2y
7y+21=7y+2 / -7y
21=2 / -21
0=-19 - Równanie sprzeczne