1又1/4+(-6.5)+3又3/8+(-1.25)+5/28=
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1又1/4+(-6.5)+3又3/8+(-1.25)+5/28=
1又1/4+(-6.5)+3又3/8+(-1.25)+5/28=
1又1/4+(-6.5)+3又3/8+(-1.25)+5/28=
1又1/4+(-6.5)+3又3/8+(-1.25)+5/28
=1.25-6-1/2 +3+3/8-1.25+5/28 (消去1.25与-1.25,合并-1/2和3/8,-6和3)
=-3+1/4+5/28 (通分)
=-3+(7+5)/28
=-3+12/28
=-3+3/7
=-2又4/7