(-3又1/8)(0.125)—0.125(-4又7/8)

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(-3又1/8)*(0.125)—0.125*(-4又7/8)

=0.125*(-3 1/8 + 4 7/8)
=1/8 * 7/4
=7/32

7/32

=0.125*（-3又1/8+4又7/8）=0.125*(14/8)=7/32