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10 x √7-√5 = 10√7 -10√5 = 10√7-10√5
√7 +√5 √7-√5 7-5 2
= 5√7 -5√5
jawaban soal no 2
4 x √3 - 1 = 4√3 -4 = 4√3 -4
√3+ 1 √3-1 3 -1 2
= 2√3
jawaban soal no 3
2 x √5-√3 = 2√5 -2√3 = 2√5-2√3
√5 +√3 √ 5-√3 5-3 2
=√5 -√3