0,\; b<0\; \; \Rightarrow |a|=a,\; |b|=-b\\\\\sqrt{48a^2b(b-b^6)}=4|a|\sqrt{3b^2(1-b^5)}=\\\\=4a|b|\sqrt{3(1-b^5)}=-4ab\sqrt{3(1-b^5)}\\\\2.\; \; x<0,\; y>0\; \; \Rightarrow \; \; |x|=-x,\; |y|=y\\\\\sqrt{63x^2y^3}=3|x|\sqrt{7y^2\cdot y}=-3x|y|\sqrt{7y}=-3xy\sqrt{7y}" alt="1).\; \; a>0,\; b<0\; \; \Rightarrow |a|=a,\; |b|=-b\\\\\sqrt{48a^2b(b-b^6)}=4|a|\sqrt{3b^2(1-b^5)}=\\\\=4a|b|\sqrt{3(1-b^5)}=-4ab\sqrt{3(1-b^5)}\\\\2.\; \; x<0,\; y>0\; \; \Rightarrow \; \; |x|=-x,\; |y|=y\\\\\sqrt{63x^2y^3}=3|x|\sqrt{7y^2\cdot y}=-3x|y|\sqrt{7y}=-3xy\sqrt{7y}" align="absmiddle" class="latex-formula">