[tex](\frac{b ^{3}}{a ^{4} } )^{2} *(-\frac{a ^{3} }{3b^{3} } )^{3} =\frac{b ^{6} }{a ^{8} } *(-\frac{a^{9} }{^{27b ^{9} } } )=[/tex]
[tex]=-\frac{a ^{9} }{27b ^{9} } *\frac{b ^{6} }{a ^{8} } =-\frac{a}{27b ^{3} }[/tex]
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[tex](\frac{b ^{3}}{a ^{4} } )^{2} *(-\frac{a ^{3} }{3b^{3} } )^{3} =\frac{b ^{6} }{a ^{8} } *(-\frac{a^{9} }{^{27b ^{9} } } )=[/tex]
[tex]=-\frac{a ^{9} }{27b ^{9} } *\frac{b ^{6} }{a ^{8} } =-\frac{a}{27b ^{3} }[/tex]