以下的公式怎么理解?=IF(OR(F2="",G2=""),0,HOUR(TIME(LEFT(G2,2),RIGHT(G2,2),0)-TIME(LEFT(F2,2),RIGHT(F2,2),0))+MINUTE(TIME(LEFT(G2,2),RIGHT(G2,2),0)-TIME(LEFT(F2,2),RIGHT(F2,2),0))/60)
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