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Step-by-step explanation:

  number 3 =1

number 4= 666836/9 decimal: 74092.8

Step-by-step explanation:

3(4 power of -1 + 2 power of -2)-2 power of -1

=3(1/4+2 power of -2)-2 power of -1

=3(1/4+1/4)-2 power of -1

=(1/4)-2 power of -1

=3/2-2 power of -1

=3/2-1/2

=1

42 power 3 +5-3 power -2

=74088+5-3 power -2

=74093-3 power -2

=74093-1/9

=666836/9