PLEASEEEE JAWAB KAKAK..

misal :1/m^2 =a , 1/n^2=b
a+2b =8...(x1)
-2a+b = -1.. (x2)
1a+2b = 8
-4a+2b= -2
_________-
5a =10
a=2

a+2b=8
2 +2b=8
2b=6
b=3

maka
1/m^2=a
1/m^2=2
m^2=1/2
m=1/akar2

1/n^2=b
1/n^2=3
n^2=1/3
n=1/akar3

maka
(m.n)/akar6
((1/akar2)(1/akar3))/akar6
(1/akar6)/akar6
=1/6
semoga membantu