-21又2/3+3又-1/4-(-2/3)-(+1/4)的计算过程;

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-21又2/3+3又-1/4-(-2/3)-(+1/4)的计算过程;-21又2/3+3又-1/4-(-2/3)-(+1/4)的计算过程;-21又2/3+3又-1/4-(-2/3)-(+1/4)的计算过

-21又2/3+3又-1/4-(-2/3)-(+1/4)的计算过程;
-21又2/3+3又-1/4-(-2/3)-(+1/4)的计算过程;

-21又2/3+3又-1/4-(-2/3)-(+1/4)的计算过程;
-21又2/3+3又-1/4-(-2/3)-(+1/4)
=(-21又2/3+2/3)+(3又1/4-1/4)
=-21+2
=-19

-21又2/3+3又-1/4-(-2/3)-(+1/4)
=-21 - 2/3 -3 -1/4 +2/3- 1/4
=-21-3 -1/2
=-24又1/2