Question

Observe a expressão :[(1/4-2/3).7/5]²-8º-0,25

Assinale a fração correspondente:

A)-121/131
B)-118/131
C)-121/144
D)-131/144

Answer 1

[(1/4-2/3).7/5]²-8°-0,25=

[(3-8/12).7/5]² - 1 - 0,25=

[(-5/12).7/5]² -1 -0,25=

[-7/12]² -1 -25/100=

49/144-1-25/100=

1225-3600-900/3600=

-3275/3600=

-131/144