а.
a/√2=
а*√2*√2*√2=
а√2/2
б.
4/√2+a=
4(√2-а)/(√2+а)(√2-а)=
4(√2-а)/(2-а²)
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Answers & Comments
а.
a/√2=
а*√2*√2*√2=
а√2/2
б.
4/√2+a=
4(√2-а)/(√2+а)(√2-а)=
4(√2-а)/(2-а²)