найти значение выражений дроби:1/2+1/4+1/8= ;1/2+1/3+1/4= ;1/2+2/3+1/5=

1/2+1/4+1/8=4/8+2/8+1/8=7/8
1/2+1/3+1/4=6/12+4/12+3/12=13/12=1 1/12
1/2+2/3+1/5=15/30+20/30+6/30=41/30=1 11/30

[tex] \frac{1}{2} + \frac{1}{4} + \frac{1}{8} = \frac{7}{8} [/tex]
[tex] \frac{1}{2} + \frac{1}{3} + \frac{1}{4} = 1 \times \frac{1}{12} [/tex]
[tex] \frac{1}{2} + \frac{2}{3} + \frac{1}{5} = 1 \times \frac{11}{30} [/tex]