A、<p style="text-indent:28px"><span style=";font-family:'Times New Roman';font-size:14px">“·”<span style="font-family:宋体">换成</span><span style="font-family:Times New Roman">“+”</span><span style="font-family:宋体">,</span><span style="font-family:Times New Roman">“+”</span><span style="font-family:宋体">换成</span><span style="font-family:Times New Roman">“·”</span></span></p><p><br/></p>
B、<p style="text-indent:28px"><span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">原变量换成反变量,反变量换成原变量</span> </span></p><p><br/></p>
C、<span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">变量不变</span> </span></p><p><br/></p>
D、<p style="text-indent:28px"><span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">常数中</span>“0”<span style="font-family:宋体">换成</span><span style="font-family:Times New Roman">“1”</span><span style="font-family:宋体">,</span><span style="font-family:Times New Roman">“1”</span><span style="font-family:宋体">换成</span><span style="font-family:Times New Roman">“0” </span></span></p><p><br/></p>
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