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U2 = a + 1b = 46 -
3b = -12
b = -12 / 3
b = -4
U2 = a + b
46 = a + (-4)
46 + 4 = a
50 = a
U25 = a + 24b
= 50 + 24 * -4
= 50 + (-96)
= -46
S25 = 25/2 (a + U25)
= 25/2 (50 + (-46))
= 25/2 * 4
S25 = 50
=12/3=4
u2=a+(2-1)4
46=a+4
a=46-4=42
jadi
s25=25/2(2x42+(25-1)4)
=12,5(84+96)
=12,5(180)=2250
maaf nya kalau ngak ngerti tanya aja :)