3. (3-√а) (3+√а)= 9-а
5. c-d/√c+√d -√c= (√c+√d)*(√c-√d) / √c+√d -√c= √c-√d-√c= -√d
6. (√а-√b) *(a+√ab+ b)= a√а + a√b + b√a - a√b - b√а - b√b= a√а- b√b
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3. (3-√а) (3+√а)= 9-а
5. c-d/√c+√d -√c= (√c+√d)*(√c-√d) / √c+√d -√c= √c-√d-√c= -√d
6. (√а-√b) *(a+√ab+ b)= a√а + a√b + b√a - a√b - b√а - b√b= a√а- b√b