(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4

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(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4
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(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4
(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4

(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4
(+71/4)-(+6.25)-(-17/2)-(+0.75)-89/4
=71/4-25/4+17/4-1/4-89/4
=(71-25+17-1-89)/4
=-27/4

原式=71/4-6.25+17/2-0.75-89/4
=17.75-6.25+8.5-0.75-22.25
=-3