Question

a)9/7-3/2=
B)3/4-1/5=
C)1/6+1/4=
D)4/7+3/4=
E)3/6-1/4=
me ajudem por favor
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Answer 1

a)

$\frac{9}{7} - \frac{3}{2}$

$= \frac{18 - 21}{14}$

$= - \frac{3}{14}$

b)

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

$= \frac{15 - 4}{20}$

$= \frac{11}{20}$

c)

$\frac{1}{6} + \frac{1}{4}$

$= \frac{4 + 6}{24}$

$= \frac{10}{24}$

$= \frac{5}{12}$

d)

$\frac{4}{7} + \frac{3}{4}$

$= \frac{16 + 21}{28}$

$= \frac{37}{28}$

e)

$\frac{3}{6} - \frac{1}{4}$

$= \frac{6 - 3}{12}$

$= \frac{3}{12}$

$= \frac{1}{4}$

Espero ter ajudado

Answer 2

Resposta:

deve-se realizar o mmc para encontrar o denominador comum

a) mmc de 7 e 2= 14 =>9/7-3/2= (18-21)/14 = -3/14

b) mmc de 4 e 4=20=> 3/4-1/5= (15-4)20= 11/20

c) mmc de 6 e 4= 12=> 1/6+1/4= (2+3)/12= 5/12

d) mmc de 7 e 4= 28=> 4/7+3/4= (16+21)/28= 37/28

e) mmc de 6 e 4= 12=> 3/6-1/4= (6-3)/12= 3/12 = 1/4