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semoga bener
√24 : √54 = √4.6 : √9.6
= 2√6 : 3√6
= 2/3
soal 2 : itu soalnya yg bener gini bukan? atau emang gitu soalnya?
(√7 + √2)(√7 - √2) = 7-2 = 5
soal 3 : soal yang dimaksud kaya gini bukan?
(√5x - 2)(√5x + 3) = 5x + 3√5x - 2√5x - 6 = 5x+√5x - 6