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7.8×101=7.8×100+7.8×1运用的是乘法


  1. A.
    结合律
  2. B.
    分配律
  3. C.
    交换律
  4. D.
    结合率和交换律
B
分析:在计算7.8×101时,可先将101拆分为100+1后,再根据乘法分配律计算.
解答:7.8×101=7.8×100+7.8×1
=7.8×(100+1),
=7.8×101=7.8×100+7.8×1.
是运用了乘法分配律.
故选:B.
点评:乘法分配律为:两个数的和与一个数相乘,可先将它们与这个数分别相乘,再相加.
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