若12+,那么△=________.
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解析分析:把0.75化成分数,原式变为×+(+△)×3+12.3=98,两边同减去12.3,得++3△=85.7,即+3△=85.7,
两边在同减去,同除以3即可.
解答:12+[×0.75+(+△)×3]+0.3=98,
??????????×+(+△)×3+12.3=98,
????????????????????????++3△=85.7,
????????????????????????????+3△=85.7,
???????????????????????????????3△=85.7-1.8,
???????????????????????????????3△=83.9,
???????????????????????????????3△=,
△=.
故