31/(√5+6)=31/(√5+6)*(√5-6)/(√5-6)=(31(√5-6))/((√5+6)(√5-6))=(31{√5-6})/(5-36)={31(√5-6)}/(-31)=-(√5-6)=-√5+6=6-√5 → А).
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31/(√5+6)=31/(√5+6)*(√5-6)/(√5-6)=(31(√5-6))/((√5+6)(√5-6))=(31{√5-6})/(5-36)={31(√5-6)}/(-31)=-(√5-6)=-√5+6=6-√5 → А).