Odpowiedzi

2010-02-24T16:27:59+01:00
A)3a+4=a+1+a+7
3a+4=2a+8
3a-2a=8-4
a=4

b)10-2b+6-b=10-b-4-b
-3b+16=-2b+4
-3b+2b=4-16
-b=-12
b=12
2010-02-24T16:29:40+01:00
A) 3a+4=a+1+a+7=7a+1=8a+7a=16a
b)10-2b+6-b=10-b-4-b=8b+6=14b-b=13
2010-02-24T16:40:39+01:00
A)
3a+4=a+1+a+7
3a-2a=7+1-4
a=4

b)
10-2b+6-b=10-b-4-b
-2b-b+2b=10-4-16
-3b+2b=6-16
-b=-10 /*(-1)
b=10