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abcd - * + ab - cd * + ab - c * d + abc - d * +
abcd*-+ ab*c-d+ ab-cd+* abc-*d+
*+-+ab/c+def+gh、ab+cde+/-f+gh+* *+-ab+/c+def+gh、ab+cde+/-f+gh+* *+-+ab/c+def+gh、ab+cde+/-+fgh+* *+-+ab/c+edf+gh、a+bcde+/-f+gh+*
bc–d*a+ abc–d*+ ab+c–d* abcd–*+
(a+b)*(c-d) a+b*c-d a+b*(c-d) (a+b)*c-d
abcbx0＞∨∧∧∨ ab∧c∨b∧x0＞∨ ab∧cb∧x＞0∨∨ ab∧cbx0＞∨∧∨
bc-d*a+ abc-d*+ ab+c-d* abcd-*+
a+b/c+d （a+/（c+ a+b/（c+ a+b+c/d
cd+ab-* ab*c-d+ abcd+-* abcd*-+
abcde*/++ abcde/+*+ abcde*+/+ abcde/*++
abcd*-+ ab*c-d+ ab-cd+* abc-*d+
*+-+ab/c+def+gh、ab+cde+/-f+gh+* *+-ab+/c+def+gh、ab+cde+/-f+gh+* *+-+ab/c+def+gh、ab+cde+/-+fgh+* *+-+ab/c+edf+gh、a+bcde+/-f+gh+*
ab+cd-* abcd+-* ab+*cd- abcd*+-
bc–d*a+ abc–d*+ ab+c–d* abcd–*+
ab*c+ abc*+ ab+ c* abc +*
a-b+c*d （a-*c+d （a-*（c+ a-b*c+d
(a+b)*(c—d) a+b*c-d a+b*(c—d) (a+b)*c—d
a+ b/c+ d (s+b)/(e+d) a+ b/ (c+d) a +b+ c/d
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