Question

Efetuar as seguintes frações?
a- 4/9 - 3/8 + 4/11
b- 5/3 + 2/9 - 4/5

Answer 1

a)
$\boxed{\frac{4}{9} - \frac{3}{8}+ \frac{4}{11} = \frac{352-297+288}{792} = \frac{343}{792}}$

b)${ \boxed{\frac{5}{3} + \frac{2}{9} - \frac{4}{5}= \frac{75+10-36}{45}= \frac{49}{45}}$

Answer 2

a) 4 - 3  +  4  =
    9   8     11

mmc (8, 9, 11) = 792

352 - 297 + 288 =
         792
343
792

b) 5  +  2  -   4  =
    3      9      5

mmc (3, 5, 9) = 45

75 + 10 - 36  =
      45
49
45