Question

( (4/5)-1 -(1/4)-1)-1
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Answer 1

$[ (\frac{4}{5}) - 1 - (\frac{1}{4}) - 1] - 1 \\ \\ [(0.8 - 1) - (0.25 - 1)] - 1 \\ [ - 0.2 - ( - 0.75)] - 1 \\ - 0.2 + 0.75 - 1 \\ 0.75 - 1.2 \\ - 0.45$