(一0.5)一(一3又1/4)十6.75一5又1/2

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(一0.5)一(一3又1/4)十6.75一5又1/2

(一0.5)一(一3又1/4)十6.75一5又1/2
(一0.5)一(一3又1/4)十6.75一5又1/2

(一0.5)一(一3又1/4)十6.75一5又1/2
(一0.5)一(一3又1/4)十6.75一5又1/2
= -1/2 +13/4 + 27/4-11/2
=(-1/2 -11/2) +(13/4 + 27/4)
= -6+10
=4

原式
=-0.5+3.25+6.75-5.5
=3.25+6.75-0.5-5.5
=10-6
=4

(一0.5)一(一3又1/4)十6.75一5又1/2
=(-1/2)+(3+1/4)+(6+3/4)+[(-5)+(-1/2)]
=[(-1/2)+(-5)+(-1/2)]+3+6+1/4+3/4
=[(-1)+(-5)]+9+1
=(-6)+10
=4