Question

porfavor!!!!!!!!preciso urgente​

Answer 1

Resposta:

2 1/2  -1 3/4

=2+1/2 -(1+3/4)

=2-1  +1/2-3/4

=1  +2*1/(2*2) -3/4

=1 +2/4-3/4

=1-1/4

=4/4 -1/4

=3/4

Letra A

Answer 2

Resposta:

○ a) 3/4

Explicação passo-a-passo:

$2 \: \frac{1}{2} - 1 \: \frac{3}{4} =$

$\frac{2 \times 2 + 1}{2} - \frac{1 \times 4 + 3}{4} = \frac{4 + 1}{2} - \frac{4 + 3}{4} = \frac{5}{2} - \frac{7}{4} =$

$m.m.c = 4$

$\frac{10 - 7}{4} = \frac{3}{4}$