Self made a rational number mixed operation problem and solution, requires the addition, subtraction, multiplication, division, the power of undocumented operation; divisor is negative; equal to 2012

（21×10²-100）÷（-1）+4012
=（2100-100）÷（-1）+4012
=2000÷（-1）+4012
= -2000+4012
=2012

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