Odpowiedzi

2010-02-24T20:17:53+01:00
1/2(x+y)=15
1/2(x-2+1/2y)=10

x+y=30
x-2+1/2y=20

-x-y=-30
x+1/2y=22

-1/2y=-8
y=16

x=30-y
x=30-16
x=14

Szukane liczby to 14 i 16.
2010-02-24T20:18:47+01:00
X , y - dane liczby
Mamy
[ x + y] / 2 = 15
[(x -2) + y/2 ] / 2 = 10
--------------------------
x + y = 15*2 = 30
x -2 + y/2 = 10*2 = 20
-------------------------
y = 30 - x
2x -4 + y = 40
---------------------
y = 30 - x
2x +(30 - x) = 44
--------------------
y = 30 - x
x = 44 - 30 = 14
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x = 14
y = 30 - 14 = 16
Odp. te liczby to 14 i 16.