(2*3*4*5)*(1/2-1/3-1/4-1/5)

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(2*3*4*5)*(1/2-1/3-1/4-1/5)

(2*3*4*5)*(1/2-1/3-1/4-1/5)
(2*3*4*5)*(1/2-1/3-1/4-1/5)

(2*3*4*5)*(1/2-1/3-1/4-1/5)
(2*3*4*5)*(1/2-1/3-1/4-1/5)
=2*3*4*5*1/2-2*3*4*5*1/3-2*3*4*5*1/4-2*3*4*5*1/5
=3*4*5-2*4*5-2*3*5-2*3*4
=60-40-30-24
=-34

2*3*4*5(-1/2-1/3-1/4-1/5)=
2*3*4*5*(-1/2)-2*3*4*5/3-2*3*4*5/4-2*3*4*5/5)
=-3*4*5-2*4*5-2*3*5-2*3*4=-60-40-30-24=-154
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