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2009-11-27T07:34:56+01:00
B-4 2b-41
-------- = 9 - ------------ /*45
5 9

9(b-4)=405-5(2b-41)
9b-36=405-10b+205
9b+10b=646
19b=646
b=34

----------------------------
b)
3c-1 6c+3
10- ------ = ----- /*22
2 11

220-11(3c-1)=2(6c+3)
220-33c+11=12c+6
-33c-12c=6-231
-45c=-225 /*(-1)
45c=225
c=5
-------------------------------------
d) 3a-7 a+17
2 - ------------- + -------------=0 /* 2-
4 5

40-5(3a-7)+4a+17)=0
40-15a+35+4a+68=0
-11a=-143 /*(-1)
11a=143
a=13
--------------------------------------------------------
E)
b+6 5-4b 8-b
--------+ --------------=--------------- /*12
2 3 6

6(b+6)+4(5-4b)=2(8-b)
6b+36+20-16b=16-2b
10b+2b=16-56
12b=40
b=3 1/3