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1 dm = decímetro
se resta
7m. 38dam
--3m -21dam
__________
4m 17dam. (1)
convirtiendo 17 dam a m
17(10)= 170m
sustituyendo en (1)
4m+170m = 174 m
convertir a dm (decímetros)
1 dam =100dm
174m(100)= 17 400 dm quedan de tela por vender