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-12m=-24
m=2
2. 45.4/3:2
15.4:2
=60:2
=30
3.
U1=5.1-1=4
u2=5.2-1=9
u3=5.3-1=14
u4=5.4-1=19
u5=5.5-1=24
4+9+14+19+24
=70
4. un=(n+1)²
misal u1=(1+1)²=2²=4