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= -3.√4.√3 - √3 + 3.√9.√3
= -3.2√3 - √3 + 3.3√3
= -6√3 - √3 + 9√3
= 2√3
2 / √7 + √5
kalikan sekawan
= 2/ √7 + √5 * (√7 - √5 / √7 - √5)
= (2)(√7) + (2)(-√5) / (√7)(√7) + (√7)(√5) + (√7)(-√5) + (√5)(-√5)
= 2√7 - 2√5 / 7 - 5
= 2√7 - 2√5 / 2
= √7 - √5