题目内容
8×4.2+8×5.8=（4.2+5.8）×8运用了________律．
乘法分配
分析：在计算8×4.2+8×5.8时，运用乘法分配律的逆运算简算，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，
运用了乘法分配律；
故答案为：乘法分配．
点评：此题考查了学生对乘法分配律的掌握与运用，乘法分配律用字母表示为a×（b+c）=ab+ac．
分析：在计算8×4.2+8×5.8时，运用乘法分配律的逆运算简算，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，
运用了乘法分配律；
故答案为：乘法分配．
点评：此题考查了学生对乘法分配律的掌握与运用，乘法分配律用字母表示为a×（b+c）=ab+ac．
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