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u1=4+2.1-3.1²
=4+2-3
=3
u2=4+2.2-3.2²
=4+4-12
=-4
u3=4+2.3-3.3²
=4+6-27
=-17
u4=4+2.4-3.4²
=4+8-48
=-36
u5=4+2.5-3.5²
=4+10-75
=-61
jadi u1,u2,u3,u4,u5=3,-4,-17,-36,-61