Question

efetua as operações
a) 2,5 • 1,3 =
b) 0,4 + 1,75 =
c) -5,7 + 3,75 =
d) 7,4
_____ =
0,5
e) ( 1,23 ) ² =
f) 1,2 • 4,77 =

Answer 1

a) 2,5 . 1,3 =
$\frac{25}{10} \times \frac{13}{10} = \frac{25 \times 13}{10 \times 10} = \frac{325}{100} = 3.25$
b)0,4 + 1,75 = 0,40 + 1,75 = 2,15

c) -5,7 + 3,75 =
$\frac{ -570 }{100} + \frac{375}{100} = \frac{ - 195}{100} = - 1.95$

d) 74/10 : 5/10 = 74/10 x 10/5 = 74/5 = 14,8

e) 123/100 x 123/100 = 15129/10000 = 1,5129

f) 12/10 x 477/100 = 5715/1000 = 5,715