4X(一1/2+1/3-1/4-1/5)X(一5)

如题所述

4X(一1/2+1/3-1/4-1/5)X(一5)
=(-20)x(-1/2+1/3-1/4-1/5)
=10-20/3+5+4
=19-20/3
=57/3-20/3
=37/3.
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