[(7又2/8+(+4又1/2)+(-18又1/8)]+[(-2.5)+(-9)]=?

[(7又2/8+(+4又1/2)+(-18又1/8)]+[(-2.5)+(-9)]=?
= 7+ 1/4 + 4 + 1/2 - 18 - 1/8 -2 -1/2 - 9
= 7 + 4 - 18 -2 - 9 + 3/8- 1/8-1/2
= - 9 -1/4
= - 9又 4分之1
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