U8=29
S17=374
.
29=a+7b
374=8,5(a+u17)
374=8,5(2a+16b)
374=17a+136b
493=17a+119b
119=-17b
b=-7
Lalu cari a
29=a+7(-7)
29=a-49
a=78
S62=62/2(2(78)+(62-1)(-7))
S62=31(156+(61)(-7))
S62=31(156+(-427))
S62=31(-217)
S62=-8.401
Semoga bermanfaat
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Penyelesaian
U8=29
S17=374
.
29=a+7b
374=8,5(a+u17)
374=8,5(2a+16b)
374=17a+136b
.
493=17a+119b
374=17a+136b
119=-17b
b=-7
.
Lalu cari a
29=a+7b
29=a+7(-7)
29=a-49
a=78
.
S62=62/2(2(78)+(62-1)(-7))
S62=31(156+(61)(-7))
S62=31(156+(-427))
S62=31(-217)
S62=-8.401
Semoga bermanfaat