Simplify.

1/2-3 (1/2+1) ^2 (I got 6 1/4, is that right?)

(1+1/3) ^2-2/9

Also are these right?

-4 (3-1) + 2 = - 6

[ (1+5) ⋅2-5]⋅2 = 14

2-4:2+2^3 = 8

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0.0025 cm << in scientific notation

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