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2010-01-09T22:24:07+01:00
A) 17y+28=19y+27
1=2y ||:2
0,5=y

spr. 17*0,5+28=19*0,5+27=
=8,5+28=9,5+27=
=36,5=36,5

b)8k-19=-8k+19
16k=38 ||:16
k=2,375

spr. 8*2,375-19=-8*2,375+19=
=19-19=-19+19=
=0=0

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2010-01-09T22:27:22+01:00
A)
17y+28 = 19y+27
17y - 19y = 27 - 28
-2y = -1 /:(-2)
y = ½

Spr.
L = 17*½ + 28 = 17/2 +28 = 8½ + 28 = 36½
P = 19*½ + 27 = 19/2 + 27 = 9½ + 27 = 36½
L = P

b)
8k-19 = -8k+19
8k + 8k = 19 + 19
16k = 38 /:16
k = 38/16
k = 2 [6/16]
k = 2⅜

Spr.
L = 8*2⅜ - 19 = 8*19/8 - 19 = 19 - 19 = 0
P = -8*2⅜ + 19 = -8*19/8 + 19 = -19 + 19 = 0
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