bantu donggg! thx utk yg mencoba bantu:)

m^2 + n^2 + 2mn
m = (1/3)^2 + 5/6-3/4
=1/9 + 5/6 - 3/4

m= 1/9 + 5/6-4/3 = 4/36 +30/36-48/36= -14/36= -7/18
n= 5/6 + 5/9 = 30/36 + 20/36= 50/36= 25/18
m*2+n*2+2mn= 49/324+ 625/324 -350/324 = 674/324 - 350/324= 324/324= 1 (A)