Question

efetue: a)1/6+1/8+1/10= b)6/9-2/4= c)12/5×7/8= d)8/3÷4/6=


ajudaaaaa por favor, eu preciso entregar isso dia 29​

Answer 1

A) Resp. 1/40

$\frac{1}{6} + \frac{1}{8} + \frac{1}{10} = \frac{1 + 1 + 1}{120} = \frac{3 ^{ \div 3} }{120 ^{ \div 3} } = \frac{1}{40}$

MMC de 6, 8, 10:

6, 8, 10 | 2

3, 4, 5 | 2

3, 2, 5 | 2 (2×2×2×3×5) = 120

3, 1, 5 | 3

1, 1, 5 | 5

1, 1, 1

B) Resp. 1/9

$\frac{6}{9} - \frac{2}{4} = \frac{6 - 2}{36} = \frac{4 ^{ \div 4} }{36 ^{ \div 4} } = \frac{1}{9}$

MMC de 9, 4:

9, 4 | 2

9, 2 | 2

9, 1 | 3 (2×2×3×3) = 36

3, 1 | 3

1, 1

C) Resp. 21/10

$\frac{12}{5} \times \frac{7}{8} = \frac{84 ^{ \div 4} }{40 ^{ \div 4} } = \frac{21}{10}$

D) Resp. 4

$\frac{8}{3} \div \frac{4}{6} = \frac{8}{3} \times \frac{6}{4} = \frac{48 ^{ \div 12} }{12 ^{ \div 12} } = \frac{4}{1} \: ou \: 4$