A simple method of multiplying 0.23 by 5 and 3 by minus one minus 19 by minus one minus 0.23 by 5.

0.23×3/5×(-1)3-19×(-1)4-0.23×2/5
=-0.23×(3/5+2/5)-19
=-0.23-19
=-19.23

Use a simple method to calculate the 2005 power of minus 3/2 times the 2005 power of 1.5

2005 Power of minus 3/2 times 2005 power of 1.5
=(-2/3×1.5)^2005
=(-1)^2005
=-1

2005 Power of minus 3 times 1.5
=(-2/3×1.5)^2005
=(-1)^2005
=-1

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