(负0.5)-(负3又4分之1)+2.75-(正7又2分之1)

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(负0.5)-(负3又4分之1)+2.75-(正7又2分之1)(负0.5)-(负3又4分之1)+2.75-(正7又2分之1)(负0.5)-(负3又4分之1)+2.75-(正7又2分之1)(负0.5)+

(负0.5)-(负3又4分之1)+2.75-(正7又2分之1)
(负0.5)-(负3又4分之1)+2.75-(正7又2分之1)

(负0.5)-(负3又4分之1)+2.75-(正7又2分之1)

(负0.5)+3又4分之1+2.75+(负7又2分之1) =-0.5+3.25+2.75-7.5=(3.25+2.75)-(0.5+7.5)=6-8=-2

负8.5

=-2/4+13/4+11/4-30/4=-9/4