Question

1/2+3/4-1/5=     :1-1/3+1/2-1/5+1/4=      calculati tinand cont de ordinea efectuarii operatiilor Ajutooor!!!!!!!

Answer 1

1.$\frac{1}{2}+ \frac{3}{4}- \frac{1}{5}= \frac{10}{20} + \frac{15}{20}- \frac{4}{20} = \frac{21}{20}$ Observatie: Am amplificat fractiile si am adus ca numitor comun 20.
2.Acum, avem $1- \frac{1}{3}+ \frac{1}{2}- \frac{1}{5}+ \frac{1}{4}= \frac{60}{60}- \frac{20}{60}+ \frac{30}{60}- \frac{12}{60} + \frac{15}{60}= \frac{73}{60}$

Answer 2

1/2+3/4-1/5=10/20+15/20-4/20=21/20
1-1/3+1/2-1/5+1/4=60/60-20/60+30/20-12/60+15/60=73/60