Jawaban:
1.
a=-3... b=7
Sn=n/2(2a+(n-1)b.
S8=8/2(2(-3)+(8-1)7
S8=4(-6+49)
S8=4(43)
S8=172..
2.
a.
S10=10/2(2(7)+9(-4))
S10=5(14-36)
S10=5(-22)
S10=-110..
b.
S10=5(2(-15)+9(3))
S10=5(-30+27)
S10=5(-3)
S10=-15..
c.
S10=5(2(80)+9(-5))
S10=5(160-45)
S10=5(115)
S10=575.
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Jawaban:
1.
a=-3... b=7
Sn=n/2(2a+(n-1)b.
S8=8/2(2(-3)+(8-1)7
S8=4(-6+49)
S8=4(43)
S8=172..
2.
a.
S10=10/2(2(7)+9(-4))
S10=5(14-36)
S10=5(-22)
S10=-110..
b.
S10=5(2(-15)+9(3))
S10=5(-30+27)
S10=5(-3)
S10=-15..
c.
S10=5(2(80)+9(-5))
S10=5(160-45)
S10=5(115)
S10=575.