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Pertama kita samakan dulu bentuk akarnya =D
√27 = 3√3
√75 = 5√3
√48 = 4√3
√12 = 2√3
Maka menjadi
3(3√3) + 5(5√3) - 6(4√3) - 7(2√3) = a
9√3 + 25√3 - 24√3 - 14√3 = a
34√3 - 38√3 = a
-4√3 = a
a = -4√3
Sekian ^_^
= 3 .3 √3 + 5 .5 .√3 - 6 .4 √3 - 7 . 2 .√3
= 9√3 + 25√3 - 24√3 - 14√3
= - 4√3