Question

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Answer 1

Răspuns:

-5/3-2/3=-7/3

6,78-5,07=1,71

7/4-9/20=13/10

5/13*26/15=2/3

2/3:5/6=4/5

1 2/3-1/3=4/3

-31/12-4/3=-47/12

7/10*10/7=1

Explicație pas cu pas:

Answer 2

Răspuns:

a)

$-\frac{5}{3} -\frac{2}{3}=\frac{-5-2}{3}=-\frac{7}{3}$

$1\frac{2}{3}-\frac{1}{3}=\frac{5}{3}-\frac{1}{3}=\frac{5-1}{3}=\frac{4}{3}$

$6,78-5,07=\frac{678}{100} -\frac{507}{100}=\frac{678-507}{100}=\frac{171}{100}=1,71$

b)

$\frac{7}{4} -\frac{9}{20}=\frac{35}{20} -\frac{9}{20}=\frac{35-9}{20}=\frac{26}{20}=\frac{13}{10}$

$-\frac{31}{12} -\frac{4}{3} =-\frac{31}{12} -\frac{16}{12} =\frac{-31-16}{12}=-\frac{47}{12}$

$0,(2)+0,(3)=\frac{2}{9} +\frac{3}{9}=\frac{2+3}{9}=\frac{5}{9}$

$7,(2)+2,(3)+2,(79)=\frac{72-7}{9} +\frac{23-2}{9} +\frac{279-2}{99} =\frac{65}{9} +\frac{21}{9} +\frac{277}{99}=\frac{715}{99} +\frac{231}{99} +\frac{279}{99}=\frac{715+231+279}{99}=\frac{1225}{99}$

c)

$\frac{5}{13} *\frac{26}{15}=\frac{1}{1} *\frac{2}{5}=\frac{2}{5}$

$\frac{7}{10} *\frac{10}{7}=\frac{1}{1} *\frac{1}{1} =1$

d)$\frac{2}{3} :\frac{5}{6}=\frac{2}{3} *\frac{6}{5}=\frac{2}{1} *\frac{2}{5} =\frac{4}{5}$