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b) (√27-√12)/√3= (3√3-2√3)/√3 = √3/√3 = 1
c) √2(√8+√50)=√2(2√2+5√2)=√2*7√2=14
d) (2√50+√72) / 2√2=(2*5√2+6√2)/2√2 = 16√2/2√2=8