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b.
b. 12√3 + √12 - 3√27
= 12√3 + 2√3 - 9√3
= 5√3
c. 7√2 - 6√3 + √3 - 3√2
= 4√2 - 5√3
d. 5√3 + 6√2 + √32 - 3√27
= 5√3 + 6√2 + 4√2 - 9√3
= -4√3 + 10√2
e. √6 + √72 - 3√32 - √24
= √6 + 6√2 - 12√2 - 2√6
= -√6 - 6√2
cek lagi, kalau salah ngehitung