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= √49x5 + √25x5 - √16x5
= 7√5 + 5√5 - 4√5
= (7 + 5 - 4) √5
= 8√5
= akar 49.5 + akar 25.5 - akar 16.5
= 7 akar 5 + 5 akar 5 - 4 akar 5
= (7 + 5 - 4) akar 5
= 8 akar 5