\frac { 7,8 } { 100 } x y - 540
Evaluate
\frac{39xy}{500}-540
Differentiate w.r.t. x
\frac{39y}{500}
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\frac{78}{1000}xy-540
Expand \frac{7,8}{100} by multiplying both numerator and the denominator by 10.
\frac{39}{500}xy-540
Reduce the fraction \frac{78}{1000} to lowest terms by extracting and canceling out 2.
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