October 2018 1 14 Report
Resuelve las siguientes pre pociones:
a) \frac{15}{20}=\frac{21}{x}
b) \frac{6}{24} =\frac{x}{21}
c) \frac{x}{24}=\frac{40}{64}
d) \frac{28}{x}=\frac{35}{55} [/tex]

de verdad ayúdenme yo soy muy mala en esto:(
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