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b)2 √3 + √7 - √3 - 3 √7 = ( 2 - 3 ) × √3 + ( 1 - 3 )×√ 7= -√3 - 2√7
c) √ 7 + 4 √ 7 -√ 7= ( 1 + 4 - 1) ×√7 = 4√7
d) -√ 2 + √ 3 - √ 3 + √ 2= ( -1 + 1 ) × √2 + (1 - 1) × √3 = √2×√3 = √6