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Sagot :

Answer:

C. 7a^4b^6/3c^2

Step-by-step explanation:

[tex]\frac{28a^{7}b^{5}c^{-4} }{12a^{3}b^{-1}c^{-2} }[/tex]

take out the constants

[tex]\frac{28}{12} *\frac{a^{7}b^{5}c^{-4} }{a^{3}b^{-1} c^{-2} }[/tex]

[tex]\frac{7}{3}*\frac{a^{7} b^{5} c^{-4} }{a^{3}b^{-1}c^{-2} }[/tex]

[tex]\frac{7a^{7-3}b^{5+1}c^{-4+2} }{3}[/tex]

[tex]\frac{7a^{4} b^{6} *\frac{1}{c^2} }{3}[/tex][tex]=\frac{7a^{4} b^{6} }{c^{2} } /3[/tex]

[tex]\frac{7a^{4}b ^{6} }{3c^{2} }[/tex]

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