Question

TODAS SON DISTINTAS :
4/7 + 1/7 =
5/3+ 1/3+ 7/3=
7/12 + 5/9 =
3/10 + 2/15+ 5/12=
8/5- 2/5=
7/3 - 1/3 - 2/3=
7/12 - 5/9=
9/10 - 2/15 - 1/12=
6 1/2 + 6 2/3=
5 3/4 - 2 1/2=
4 2/3 - 2 1/5 + 1 2/3 =
4/5 x 2/3 =
5/2 x 7/3 x 1/4 =
4/7 x 4 =

Answer 1

Explicación paso a paso:

Resolvamos:

1)

$\frac{4}{7} + \frac{1}{7}=\frac{(4)+(1)}{7} =\frac{5}{7}$

2)

$\frac{5}{3} + \frac{1}{3}+ \frac{7}{3}=\frac{(5)+(1)+(7)}{3} =\frac{13}{3}$

3)

$\frac{7}{12} + \frac{5}{9}=\frac{(7)(3) + (5)(4) }{36} =\frac{21+20}{36} =\frac{41}{36}$

4)

$\frac{3}{10} + \frac{2}{15}+ \frac{5}{12}=\frac{(3)(6) +(2)(4) +(5)(5) }{60} =\frac{18+8+25}{60} =\frac{51}{60} =\frac{17}{20}$

5)

$\frac{8}{5} - \frac{2}{5}=\frac{(8)-(2)}{5} =\frac{6}{5}$

6)

$\frac{7}{3} - \frac{1}{3}- \frac{2}{3}=\frac{(7)-(1)-(2)}{3} =\frac{4}{3}$

7)

$\frac{7}{12} - \frac{5}{9}=\frac{(7)(3) - (5)(4) }{36} =\frac{21-20}{36} =\frac{1}{36}$

8)

$\frac{9}{10} - \frac{2}{15}- \frac{1}{12}=\frac{(9)(6) -(2)(4) -(1)(5) }{60} =\frac{54-8-5}{60} =\frac{41}{60}$

9)

$6\frac{1}{2} +6 \frac{2}{3}=\frac{13}{2} + \frac{20}{3}=\frac{(13)(3) + (20)(2) }{6} =\frac{39+40}{6} =\frac{79}{6}$

10)

$5\frac{1}{4} -2 \frac{1}{2}=\frac{21}{4} - \frac{5}{2}=\frac{(21)(1) - (5)(2) }{4} =\frac{21-10}{4} =\frac{11}{4}$

11)

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

12)

$\frac{5}{2}\times \frac{7}{3}\times \frac{1}{4}=\frac{5 \times 7 \times 1}{2 \times 3 \times 4}=\frac{35}{24}$

13)

$\frac{4}{7}\times4=\frac{4}{7}\times \frac{4}{1}=\frac{4 \times 4}{7}=\frac{16}{7}$