Question

Calculati,grupand convenabil termenii:
a)11 9supra15+4 4supra13+10 5supra26+8 2supra5+½.
b)49supra100+1supra10+1supra100+9supra10.
c)4supra25+2supra15+7supra12+11supra100+3supra50+7supra60.
d)1supra5+14supra15+9supra14+5supra84+49supra75.

Answer 1

b)$\frac{49}{100}+ \frac{1}{100}+ \frac{1}{10}+ \frac{9}{10} =$

=$\frac{50}{100} + \frac{10}{10}=$

=$\frac{1}{2} +1=$ (aducema la acelasi numitor

=$\frac{3}{2}$

c)$\frac{4}{25} + \frac{2}{15} + \frac{7}{12} + \frac{11}{100} + \frac{3}{50}+ \frac{7}{60}=$ -aducem la acelasi numitor 300

=$\frac{(12*4)+(20*2)+(25*7)+(3*11)+(6*3)+(5*7)}{300} =$

=$\frac{48+40+175+33+30+35}{300} =$

=$\frac{361}{300}$