А) (√3+√2)/(√48+√32)=(√3+√2)/(4√3+4√2)=(√3+√2)/4(√3+√2)=1/4
б) 32/(9-3(3√5)+(3√25))-(3√5)=(32-(3√5)(9-3(3√5)+(3√25))/(9-3(3√5)+(3√25))=(32-9(3√5)+3(3√25)-(3√125))/(9-3(3√5)+(3√5))=(32-9(3√5)+3(3√25)-5)/(9-3(3√5)+(3√5))=((27-9(3√5)+3(3√25)):3)/((9-3(3√5)+(3√25)):3)=(9-3(3√5)+(3√25))/((9-3(3√5)+(3√25)):3)=1/(1:3)=3