用简便计算99×48
解：采用分配律，
原式=（100-1）x48
=100x48-48
=4800-48
=4752
用简便计算99×48
99×48
=（100-1）x48
=100x48-1x48
=4800-48
=4752
=（100-1）×48
=100×48-48
=4800-48
=4752
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99×48
=（100-1）×48
=100×48-48
=4800-48
=4752
99×48
=（100-1）×48
=4800-48
=4752
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