5.
u2+u4=26
u8-u5=9
u10=………??
u2+u4=26……………………………u8-u5=9
(a+b)+(a+3b)=26………………(a+7b)-(a+4b)=9
2a+4b=26……………………………3b=9•••b=3
a+2b=13
a=13-2(b)
a=13-2(3)=13-6=7
u10=a+9b
=7+9(3)=7+27=34
6.
u2=5=a+b
u4+u6=28=(a+3b)+(a+5b)=2a+8b
a+b=5____×2=2a+2b=10
______________2a+8b=28_
6b=18
b=3
a+b=5
a=5-3=2
u9=a+8b=2+8(3)=2+24=26
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5.
u2+u4=26
u8-u5=9
u10=………??
u2+u4=26……………………………u8-u5=9
(a+b)+(a+3b)=26………………(a+7b)-(a+4b)=9
2a+4b=26……………………………3b=9•••b=3
a+2b=13
a=13-2(b)
a=13-2(3)=13-6=7
u10=a+9b
=7+9(3)=7+27=34
6.
u2=5=a+b
u4+u6=28=(a+3b)+(a+5b)=2a+8b
a+b=5____×2=2a+2b=10
______________2a+8b=28_
6b=18
b=3
a+b=5
a=5-3=2
u9=a+8b=2+8(3)=2+24=26
semoga membantu dan bermanfaat