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u5+u7= 2a+10b=144. l. x 1
2a +4b= 72
3a+10b =144 dikurangi
= -6b = -27
b = 12
a+2b=36
a+2(12)=36
a+2a=36
a=36-24
a=12
sn = 1\2 n (2a+n-1) b
s10=10\2 (2.12+9.12)
= 5(24+108)
=5(132)
=660