Odpowiedzi

2010-01-09T10:08:30+01:00
5p-2r=21 /×3
3p+5r=-6 /× -5
15p-6r=63
-15p-25r=30
-31r=93
r=-3
5p-2×(-3)=21
5p+6=21
5p=21-6
5p=15
p=3


4 4 4
2010-01-09T10:10:47+01:00
A)
5p-2r=21 / *3
3p+5r=-6 /*(-5)

15p-6r=63
-15p-25r=30
____________
-31r=93/ /(-31)
r=-3

5p-2r=21 /*5
3p+5r=-6 /*2

25p-10r=105
6p+10r= -12
____________
31p= 93/ /31
p=3
r=-3
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