A、<em><span style="font-family: 'Times New Roman';font-size: 14px">A</span></em><span style=";font-family:'Times New Roman';font-size:14px">+</span><em><span style="font-family: 'Times New Roman';font-size: 14px">AB</span></em><span style=";font-family:'Times New Roman';font-size:14px">=</span><em><span style="font-family: 'Times New Roman';font-size: 14px">A</span></em><span style=";font-family:'Times New Roman';font-size:14px"> </span></p><p><br/></p>
B、<em><span style="font-family: 'Times New Roman';font-size: 14px">A</span></em><span style=";font-family:'Times New Roman';font-size:14px">+</span><em><span style="font-family: 'Times New Roman';font-size: 14px">AB</span></em><span style=";font-family:'Times New Roman';font-size:14px">=</span><em><span style="font-family: 'Times New Roman';font-size: 14px">B</span></em><span style=";font-family:'Times New Roman';font-size:14px"> </span></p><p><br/></p>
C、<em><span style="font-family: 'Times New Roman';font-size: 14px">A</span></em><span style=";font-family:'Times New Roman';font-size:14px">+</span><em><span style="font-family: 'Times New Roman';font-size: 14px">BC</span></em><span style=";font-family:'Times New Roman';font-size:14px">=<span style="font-family:宋体">(</span></span><em><span style="font-family: 'Times New Roman';font-size: 14px">A</span></em><span style=";font-family:'Times New Roman';font-size:14px">+</span><em><span style="font-family: 'Times New Roman';font-size: 14px">B</span></em><span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">)(</span></span><em><span style="font-family: 'Times New Roman';font-size: 14px">A</span></em><span style=";font-family:'Times New Roman';font-size:14px">+</span><em><span style="font-family: 'Times New Roman';font-size: 14px">C</span></em><span style=";font-family:'Times New Roman';font-size:14px"><span style="font-family:宋体">)</span></span></p><p><br/></p>
D、<p style="text-indent:28px"><span style=";font-family:'Times New Roman';font-size:14px">A+BC=A+B+C</span></p><p><br/></p>
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