原式
=3/4-8+2又1/3-3又1/4+1又2/3
=(3/4-3又1/4)-8+(2又1/3+1又2/3)
=-2又1/2-8+4
=-6又1/2
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(+3/4)-(+8)+(2又1/3)-(+3又1/4)-(-1又2/3)
= 3/4-8+ 2又1/3-3又1/4 +1又2/3
= 3/4-3又1/4 + 2又1/3 +1又2/3 -8
= -2又1/2+4 -8
= -2又1/2-4
= -6又1/2