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48×99=48×100-48=4800-48,这是运用了________律,用字母表示是________.

乘法分配    a×(b+c)=a×b+a×c
分析:根据题意,由乘法分配律进行解答即可.
解答:48×99=48×100-48=4800-48,这是运用了乘法分配律;用字母表示是:a×(b+c)=a×b+a×c.
故答案为:乘法分配,a×(b+c)=a×b+a×c.
点评:本题主要考查乘法分配律的运用,然后再进一步解答即可.
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