精选优质文档-倾情为你奉上数学总结主要符号plus ;positiveminus ;negativemultiplied by ;timesdivided byEqualsapproximately equalsnot equal toless thangreater thanequal to or less than equal to or greater than o( )round brackets ;parentheses square brackets Bracesis a member of the setis a subset ofsimilar tocongruent to*denotes an operationThereforeBecauseratio sign, divided by, is toequa
