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我对广西师范大学出版社出版的《达标课课练》人教(课标版)数学七年级下册上的一道例题和习题持有疑异,谨向同行请教.例题(原文)判断下列语句是不是命题,如果是命题,请将其改写成“如果……那么……”的形式.三角形的内角和为180°.解(原参考答案):是命题.改为:如果一个图形是三角形,那么它的内角和为180°.课时演练(原文):将命题:“等角的补角相等”改写成“如果……那么……”的形式.解(原参考答案):如果两个角相等,那么它们的补角也相等.我认为例题应该改为:如果是三角形的内角和,那
I am on the Guangxi Normal University Press published “standard class practice” PEP (mathematics version) mathematics seventh grade volume on a sample of questions and exercises are in doubt, I would like to peer advice.Examples (original) to determine the following statement Is not proposition, if proposition, please rewrite it as “if ... then ... ” the form of the interior angle of the triangle and 180. Solution (the original reference answer): proposition. Instead: if a graphic Is a triangle, then its interior angle is 180 °. Time Walkthrough (original): The proposition: “equiangular supplementary angle equal to” rewritten as “if ... then ...”. Answer): If the two angles are equal, then their complement angle is equal. I think the example should be changed to: If it is the interior angle of the triangle, that