624*78 46*589 简便计算.
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624*7846*589简便计算.624*7846*589简便计算.624*7846*589简便计算.624*78=624*(100-22)=62400-13728=4867246*589=(50-4
624*78 46*589 简便计算.
624*78 46*589 简便计算.
624*78 46*589 简便计算.
624*78
=624*(100-22)
=62400-13728
=48672
46*589
=(50-4)*589
=29450-2356
=27094
624*78 =(600+24)*(80-2)=600*80+80*24-600*2-24*2=48672
624*78
=624*(100-22)
=62400-13728
=48672
46*589
=(50-4)*589
=29450-2356
=27094