A、<em><span style="font-size:14px;font-family:'Times New Roman','serif'">R</span></em><sub><span style="font-size:14px;font-family:'Times New Roman','serif'">1</span></sub><span style="font-size:14px;font-family:'Times New Roman','serif'">>(<em>R</em><sub>2</sub>+<em>R</em><sub>3</sub>)</span>
B、<em><span style="font-size:14px;font-family:'Times New Roman','serif'">R</span></em><sub><span style="font-size:14px;font-family:'Times New Roman','serif'">1</span></sub><span style="font-size:14px;font-family:'Times New Roman','serif'">=(<em>R</em><sub>2</sub>+<em>R</em><sub>3</sub>)</span>
C、<em><span style="font-size:14px;font-family:'Times New Roman','serif'">R</span></em><sub><span style="font-size:14px;font-family:'Times New Roman','serif'">1</span></sub><span style="font-size:14px;font-family:'Times New Roman','serif'"><(<em>R</em><sub>2</sub>+<em>R</em><sub>3</sub>)</span>
D、<em><span style="font-size:14px;font-family:'Times New Roman','serif'">R</span></em><sub><span style="font-size:14px;font-family:'Times New Roman','serif'">1</span></sub><span style="font-size:14px;font-family:'Times New Roman','serif'">=<em>R</em><sub>2</sub>-<em>R</em><sub>3</sub></span>
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