Question

1) 3/5 x 10/7 b) 7/12x600 2) 3/8 + 2/5 b) 7/10+3​

Answer 1

As expressões são :

1.

${{\boxed{{\boxed{\blue{\boxed{\Large{\rm{\purple { a) \:\frac{6}{7} \: }}}}}}}}}}$

${{\boxed{{\boxed{\blue{\boxed{\Large{\rm{\purple { a)\: 350 \:}}}}}}}}}}$

2.

${{\boxed{{\boxed{\blue{\boxed{\Large{\rm{\red { a)\: \frac{31}{40} \: }}}}}}}}}}$

${{\boxed{{\boxed{\blue{\boxed{\Large{\rm{\red { b)\: \frac{37}{10} \: }}}}}}}}}}$

Montando as expressões:

1.

a)

$\frac{3}{5}\: \times \frac{10}{7} \\\\\frac{3\:\times\:10}{5\: \times \:7} \\\\\frac{30}{35} \\\\\dfrac{6}{7}$

b)

$\frac{7}{12} \:\times\:600\\\\\frac{7\:\times\:600}{12} \\\\\frac{4200}{12} \\\\ \:350$

$------$

2.

a)

$\frac{3}{8} +\frac{2}{5} \\\\\frac{15}{40} +\frac{16}{40} \\\\\frac{15\:+\:16}{40} \\\\\dfrac{31}{40}$

b)

$\frac{7}{10} +3\\\\\frac{7}{10} + \frac{30}{10} \\\\\frac{7\:+\:30}{10} \\\\\dfrac{37}{10}$

${{\boxed{{\boxed{\purple{\boxed{\Large{\rm{\blue { ATT: Miguel }}}}}}}}}}$

Answer 2

1.

3/5 . 10/7 : (5)

3 . 2/7

(3 . 2)/7

6/7

2.

7/12 . 600 : (12)

7 . 50

350

3.

3/8 + 2/5

mmc(8 , 5) = 40

15/40 + 16/40

(15 + 16)/40

31/40

4.

7/10 + 3

7/10 + 3/1

mmc(10 , 1) = 10

7/10 + 30/10

(7 + 30)/10

37/10

att. yrz