624*78要怎么简便计算
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624*78要怎么简便计算
624*78要怎么简便计算
624*78要怎么简便计算
624*78=(625-1)*78=625*78-78=625*80-625*2-78=(5000/8)*80-1250-78=50000-1250-78=48750-78=48672
624*78=(620+4)*(80-2)=49600-1240+32-8=49632-1248=48384