用尺規(guī)作圖法作已知角∠AOB的平分線的步驟如下:
①以點(diǎn)O為圓心,任意長(zhǎng)為半徑作弧,交OB于點(diǎn)D,交OA于點(diǎn)E;
②分別以點(diǎn)D,E為圓心,以大于 DE的長(zhǎng)為半徑作弧,兩弧在∠AOB的內(nèi)部相交于點(diǎn)C;
③作射線OC.
則射線OC為∠AOB的平分線.
由上述作法可得△OCD≌△OCE的依據(jù)是( )
4×(5+1)×(52+1)=(5﹣1)×(5+1)×(52+1)
=(52﹣1)×(52+1)=252﹣1=624.
請(qǐng)借鑒小黃的方法計(jì)算:
(1+ )×(1+ )×(1+ )×(1+ )×(1+ )×(1+ )×(1+ ),結(jié)果是.