Question

Determine as diferenças das frações:

a) 1/3 - 1/5=

b) 5/4 - 4/5=

c)3 (inteiros) -2/5= 

d)3 (inteiros) 1/2 - 2 (inteiros) 3/4=

Answer 1

$a) \ \frac{1}{3}-\frac{1}{5}=\frac{5-3}{15}=\frac{2}{15}\\ \\ b) \ \frac{5}{4}-\frac{4}{5}=\frac{25-16}{20}=\frac{9}{20}\\ \\ c) \ 3-\frac{2}{5}=\frac{15}{5}-\frac{2}{5}=\frac{13}{5}\\ \\ d) \ 3\frac{1}{2}-2\frac{3}{4}=\frac{7}{2}-\frac{11}{4}=\frac{14-11}{4}=\frac{3}{4}$

Answer 2

a) 1/3 - 1/5 =  5 - 3/15 = 2/15

b) 5/4 - 4/5 = 25 - 16/20 = 9/20

c) 3/1 - 2/5 =  15 - 2/5 = 13/5

d) 3 1/2 - 2 3/4 = 7/2 - 11/4 = 14 - 11/4 = 3/4