Question

Efectuati adunarile :
A) -3 1/14+ (-1 2/7+5/6)
B) (-1 2/3+5/8)+(-3 1/8+3 2/3)
C) (-2 3/4+1 1/6)+(-1 2/3+2 7/12)
D) (-3 2/5+1 1/4)+(-1 3/5+2 5/21)
VA ROG RASPUNDETI RAPID , E URGENT !

Answer 1

A) -3 * $\frac{1}{14}$+ (-1 * $\frac{2}{7}$+$\frac{5}{6}$)=$\frac{-3}{14}$+($\frac{-2}{7}$+$\frac{5}{6}$ )= $\frac{-3}{14}$ + $\frac{23}{42}$= $\frac{1}{3}$

B) (-1*$\frac{2}{3}$+$\frac{5}{8}$)+(-3 * $\frac{1}{8}$+3* $\frac{2}{3}$)=($\frac{-2}{3}$ + $\frac{5}{8}$)+ ($\frac{-3}{8}$+2)= ($\frac{-1}{24}$)+$\frac{13}{8}$= $\frac{-1}{24}$+$\frac{13}{8}$=$\frac{19}{12}$

C) (-2* $\frac{3}{4}$+$\frac{11}{6}$)+(-1 * $\frac{2}{3}$+2* $\frac{7}{12}$) =($\frac{-3}{2} + \frac{11}{6}$)+ ($\frac{-2}{3} +\frac{7}{6}$)= $\frac{1}{3} +\frac{1}{2}$=$\frac{5}{6}$

D) (-3*$\frac{2}{5}$+$\frac{11}{4}$)+(-1* $\frac{3}{5}$+2* $\frac{5}{21}$) =($(\frac{-6}{5} +\frac{11}{4} )+ (\frac{-3}{5} +\frac{10}{21} )$=$\frac{31}{20} +(\frac{-13}{105} )$=$\frac{31}{20} -\frac{13}{105}$=$\frac{599}{420}$=$1 \frac{179}{420}$

Succes!