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a=80.000
b=3/4x80.000=60.000
=80.000-60.000
=20.000
U3=a-(3-1)20.000
=80.000-40.000
=40.000
2.)
U15=a+(15-1)b=172
U7=a+(7-1)b=100
a=6a+84b=1032
14a+84b=1400
a=-8a=368
a=46
U7=46+(7-1)b=100
=46+6b=100
=6b=100-46
=b=7,6
U11=46+(11-1)7,6=122
3.)
U10/U7=96/12
U3=8
U3=a.r²
a.r²=8