Question

Calcule:
$( - \frac{5}{12}) \times ( + \frac{4}{25})$
$( -2.5)\times\: (- 0.5)$
$\frac{3}{4} + 0.25$
$\frac{3}{8} - \frac{3}{4}$
$( + \frac{4}{5}) \div ( + \frac{16}{15} )$

Answer 1

Explicação passo-a-passo:

A) -5/12×4/25= -20/300.

-5×4= -20

12×25= 300

B) -2,5×-0,5= +1,25.

( - ) e ( - )= ( + ).

C) 3/4+0,25=

0,25= 2/8

3/4+2/8= 8/8.

mmc de 4 e 8= 8.

4,8/2

2,4/2

1,2/2

1,1

6/8+2/8= 8/8.

D) 3/8-3/4=

mmc de 8 e 4= 8

3/8-6/8= -3/8.

E) 4/5÷16/15=

4/5×15/16= 60/80 ÷4= 15/20.