The first is (-654.796)/(-100) ?

Negative divided by negative = positive.

= 654.796 / 100

To make the denominator 100 as 1 only, move the decimal point two places to the left.

100. ----------------> 1.00

You do that in the denominator, you also do that in the numerator. Move the decimal point two places to the left.

654.796 ----------------> 6.54796

Then, 6.54796 / 1 = 6.54796 ------------the answer.

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0.01x{[(4-0.25)/2.5]-(4.5-4.025)}

You worked hard to get to this expression, huh?

Very good job!

Except that you could have not included the "x" for "times".

Use the "*" for "times" the next time, if you want to emphasize "times".

I don't know how to explain this now, but we do first the "inner" things, the addition or subtraction inside the parentheses. Things like that.

= 0.01*{[(3.75)/2.5]-(0.475)}

Now the 3.75/2.5,....(use a calculator if it is allowed)

= (0.01){1.5 -0.475}

= (0.01){1.025}

= 0.01025 --------------------answer.