Oblicz S10
a) a1=5
a10=23
b) a1=12
a10=-15
Proszę o szybką odp.
a)
S10=(a1+a10)*n/2
S10=(5+23)*10/2
S10=28*5=140
b)
S10=(12-15)*10/2
S10=-15
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a)
S10=(a1+a10)*n/2
S10=(5+23)*10/2
S10=28*5=140
b)
S10=(a1+a10)*n/2
S10=(12-15)*10/2
S10=-15