X+y=8Jest ciąg arytmetyczny x,y,19Ile wynosi x i y?
x=-1
y=9
a1=-1
a2=9
a3=19
x+y=8
r=10
a3-a1=2r
19+1=2r
2r=20 /:2
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x=-1
y=9
a1=-1
a2=9
a3=19
x+y=8
r=10
a3-a1=2r
19+1=2r
2r=20 /:2
r=10