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b 7√2-4√3-12√5
c.
6√2 + 4√2 - 10√2 = ( 6+4-10)√2
= 0
jawaban soal B
7√2 - 6√3 + 2√3 - 6√20
= 7√2 - 6√3 + 2√3 - 24√5
= 7√2 -3√3 - 24√5
jawaban soal C
3√45 - 6√72 + 2√32 - 6√20
= 9√5 - 36√2 + 8√2 - 12√5
= -3√5 - 28√2