Question

calculati
a)3- 2/5
b)1 -1/4
c)2 1/2 -1 1/3
d)1 1/5 -1
e)3 3/2 -2
f)2 1/5 -1 1/4
g) 3 1/4 - 2 1/7
h)4 1/5 -2 1/10
i)5 - 4 1/3
VA ROG SA MA AJUTATI DAU COROANA IMEDIAT....

Answer 1

A)
$3 - \frac{2}{5} = \frac{5 \times 3 - 2}{5} = \frac{13}{5}$
B)
$1 - \frac{1}{4} = \frac{4 \times 1 - 1}{4} = \frac{3}{4}$
C)
$2 \frac{1}{2} - 1 \frac{1}{3} = \frac{2 \times 2 + 1}{2} - \frac{1 \times 3 + 1}{3} =$

$= \frac{5}{2} - \frac{4}{3} = \frac{3 \times 5 - 2 \times 4}{6} = \frac{15 - 8}{6} =$


$= \frac{7}{6}$

D)
$1 \frac{1}{5} - 1 = \frac{1 \times 5 + 1}{5} - 1 = \frac{6}{5} - 1 =$


$\frac{6 - 5 \times 1}{5} = \frac{1}{5}$
E)
$3 \frac{3}{2} - 2 = \frac{3 \times 2 + 3 }{2} - 2 = \frac{9}{2} - 2$


$= \frac{9 - 2 \times 2}{2} = \frac{5}{2}$
F)
$2 \frac{1}{5} - 1 \frac{1}{4} = \frac{2 \times 5 + 1}{5} - \frac{1 \times 4 + 1}{4} =$


$= \frac{11}{5} - \frac{5}{4} = \frac{4 \times 11 - 5 \times 5}{20} = \frac{44 - 25}{20} =$


$= \frac{19}{20}$
G)
$3 \frac{1}{4} - 2 \frac{1}{7} = \frac{3 \times 4 + 1}{4} - \frac{2 \times 7 + 1}{7} =$


$= \frac{13}{4} - \frac{15}{7} = \frac{7 \times 13 - 4 \times 15}{28}$


$= \frac{91 - 60}{28} = \frac{31}{28}$

H)
$4 \frac{1}{5} - 2 \frac{1}{10} = \frac{4 \times 5 + 1}{5} - \frac{2 \times 10 + 1}{10}$


$= \frac{21}{5} - \frac{21}{10} = \frac{2 \times 21 - 21}{10} = \frac{42 - 21}{10}$


$= \frac{21}{10}$
I)
$5 - 4 \frac{1}{3} = 5 - \frac{4 \times 3 + 1}{ 3} = 5 - \frac{13}{3}$


$= \frac{3 \times 5 - 13}{3} = \frac{15 - 13}{3} = \frac{2}{3}$