Question

1-[0.3-{0.5-(0.2-0.7)-0.1}]

Answer 1

Here is your answer
$1 - (0.3 - (0.5 - ( - 0.5) - 0.1) )\\ = 1 - (0.3 - (0.5 + 0.5 - 0.1)) \\ = 1 - (0.3 - (1 - 0.1)) \\ = 1 - (0.3 - 0.9) \\ = 1 - ( - 0.6) \\ = 1 + 0.6 \\ = 1.6$
Hope it helps you