(+3/4)+(-2 3/4)+(+0.125)+(-12 5/7)+(-4 1/8)

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(+3/4)+(-2 3/4)+(+0.125)+(-12 5/7)+(-4 1/8)
(+3/4)+(-2 3/4)+(+0.125)+(-12 5/7)+(-4 1/8)

(+3/4)+(-2 3/4)+(+0.125)+(-12 5/7)+(-4 1/8)
(+3/4)+(-2 3/4)+(+0.125)+(-12 5/7)+(-4 1/8)
=0.75+(-2.75)+(0.125)+(-12 5/7)+(-4.125)
=0.75-2.75+0.125-12 5/7-4.125
=(0.75-2.75)+(0.125-4.125)-12 5/7
=-2-4-12 5/7
=-6-12 5/7
=-18 5/7
(即-18又5/7,也可以化为-131/7)