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u5+u7 = (a+4b) + (a+6b) = 36
= 2a + 10b = 36
= a + 5b = 18
a + 5b = 18....>(u3)
a + 2b = 9 -.....> (u5 +u7)
3b = 9
b = 3
a + 2b = 9
a + 6 = 9
a= 3
S10 = 1/2n ( 2a+ (n-1)b
= 5 ( 6 + (9)3
= 5 ( 6 + 27)
= 5( 33)
= 165....D
U5+U7=36
S10?
U3=a+2b=9
a=9-2b.........................(1)
U5+U7=36
a+4b+a+6b=36
2a+10b=36......................(2)
subtitusi pers. 1 ke pers.2
2(9-2b)+10b=36
18-4b+10b=36
18+6b=36
6b=18
b=3
a=9-2b
a=9-6
a=3
S10=10/2(2a+9b)
=5(6+27)
=5x33
=165