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b) (2a√12+a/3√27-√3)×√3 = 2a√36+a/3√81-3=2a*6+a/3*9-3= 12a+3a-3=15a-3
c) √1/3 ( 2x√6+4√3-3√1/3+x√54) = 2x√2+4-1+x√18=2x√2+3+3x√2=5x√2+3