(a²-9b²)/(0,5a+1,5b)=(a²-(3b)²)/(0,5a+1,5b)=2*(a2-(3b)²)/(2*(0,5a+1,5b))=
=2*(a+3b)(a-3b)/(a+3b)=2*(a-3b)=2a-6b=1.
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(a²-9b²)/(0,5a+1,5b)=(a²-(3b)²)/(0,5a+1,5b)=2*(a2-(3b)²)/(2*(0,5a+1,5b))=
=2*(a+3b)(a-3b)/(a+3b)=2*(a-3b)=2a-6b=1.