Question

Me ajudam ai por favor:
A) 1/2-3/10=
B) 9/10-3/4=
C) 2/4-2/10=
D) 6/5-5/10=
E) 8/10-1/10=
F) 8/16-4/8=

Answer 1

Se os dominadores são diferentes, fazemos o MMC deles, e dividimos o resultado pelos denominadores, o resultado dessa divisão multiplicaremos pelos numeradores.

ex: 1/2 - 3/10=

5/10 - 3/10= 2/10

→ 10 : 10= 1 . 3= 3

→ 10 : 2= 5 . 1= 5

→ MMC= 10

a) 1/2 - 3/10=

5/10 - 3/10= 2/10

b) 9/10 - 3/4=

90/20 - 15/20= 75/20

c) 2/4 - 2/10=  

10/20 - 4/20= 6/20

d) 6/5-5/10=

12/10 - 5/10= 7/10

e) 8/10-1/10= 7/10

f) 8/16 - 4/8=

8/16 - 8/16= 0

Answer 2

$\frac{1}{2} - \frac{3}{4} = \frac{5 - 3}{10} = \frac{2}{10} = \frac{1}{5} \\ \\ \frac{9}{10} - \frac{3}{4} = \frac{18 - 15}{20} = \frac{3}{20} \\ \\ \frac{2}{4} - \frac{2}{10} = \frac{1}{2} - \frac{2}{10} = \frac{5 - 2}{10} = \frac{3}{10} \\ \\ \frac{6}{5} - \frac{5}{10} = \frac{12 - 5}{10} = \frac{7}{10} \\ \\ \frac{8}{10} - \frac{1}{10} = \frac{8 - 1}{10} = \frac{7}{10} \\ \\ \frac{8}{16} - \frac{4}{8} = \frac{4}{8} - \frac{4}{8} = 0$