0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)
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0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)原式=0-21
0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)
0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)
0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)
原式
=0-21又2/3+3又1/4+2/3-1/4
=(2/3-21又2/3)+(3又1/4-1/4)
=-21+3
=-18
原式
=0-21又2/3+3又1/4+2/3-1/4
=(2/3-21又2/3)+(3又1/4-1/4)
=-21+3
=-18
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