原式=[1*2*3*(1+6+4+7)]/[1*3*5*(1+2+4+7)]=(2*3*18)/(3*5*14)=18/35
1X2X3+2X3X6十4X8X12十7X14X21/1X3X5十2X6X10十4X12X20十7X21X35的结果是什
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