[(6a-5b)/(√6a+√5b) + √5b ]²=
=[(6a-5b)(√6a-√5b)/(6a+5b) +√5b ]^2=
=(√6a-√5b + √5b )²=(√6a)²=6a
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[(6a-5b)/(√6a+√5b) + √5b ]²=
=[(6a-5b)(√6a-√5b)/(6a+5b) +√5b ]^2=
=(√6a-√5b + √5b )²=(√6a)²=6a