1.)diketahui
a=160
b=1/2(setengah)
rumus suku ke-n
Un=a+(n-1)b
Un=160+(n-1)1/2
Un=160+1/2n-1/2
Un=1/2n+160-1/2
Un=1/2n+159,5
U7=(1/2×7)+159,5
=3,5+159,5
=163
S7=7/2 (2×160+(7-1)1/2)
=7/2 (320+3)
=7/2 (323)
=7×323÷2
=2261÷2
=1130,5
saya cuma bisa bantu itu saja☺
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1.)diketahui
a=160
b=1/2(setengah)
rumus suku ke-n
Un=a+(n-1)b
Un=160+(n-1)1/2
Un=160+1/2n-1/2
Un=1/2n+160-1/2
Un=1/2n+159,5
U7=(1/2×7)+159,5
=3,5+159,5
=163
S7=7/2 (2×160+(7-1)1/2)
=7/2 (320+3)
=7/2 (323)
=7×323÷2
=2261÷2
=1130,5
saya cuma bisa bantu itu saja☺