a)[tex]\left(\frac{1}{4}\div10 \right)\times\left(\frac{20}{10}\right)=\frac{1}{2}[/tex]
b)[tex]\left(\frac{1}{2}\div10\right)\times\left(\frac{68}{10}\right)=0,34[/tex]
c)[tex]\left(\frac{35}{10}\right)\times\left(\frac{900}{10}\right)=315[/tex]
d)[tex]\left(\frac{40}{10}\right)\times\left(\frac{120}{10}\right)=48[/tex]
Espero ter AJUDADO!!!!!!!!!!!!
