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!! +exec+ +var+ +string+
tit:rawmath
type:$type_both
syntax:!rawmath `expr'
mean:把可能含有常见错误的数学式 `expr' 翻译成机器能理解的数学式. <br>\
它把 `(x+1)(x-1)' 变成 `(x+1)*(x-1)',\
把 `5x^3' 变成 `5*x^3', 等等.