8×4.2+8×5.8=(4.2+5.8)×8運(yùn)用了________律.

乘法分配
分析:在計(jì)算8×4.2+8×5.8時(shí),運(yùn)用乘法分配律的逆運(yùn)算簡(jiǎn)算,即8×4.2+8×5.8=(4.2+5.8)×8.
解答:8×4.2+8×5.8=(4.2+5.8)×8,
運(yùn)用了乘法分配律;
故答案為:乘法分配.
點(diǎn)評(píng):此題考查了學(xué)生對(duì)乘法分配律的掌握與運(yùn)用,乘法分配律用字母表示為a×(b+c)=ab+ac.
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