d5301e2ad28845ac9b4d3760f826b4f9-48数学乘法分配律32b288ada0a8800bb2dafadbeb4ba9-ld

aab15d74299b4fc4ab5c059b1f3163f7-4《乘法结合律》406b94d9ce7c0e10bdcc1c75bc0a4e6-ld

18a60f63de04423aad3f072ba7145d32-02《乘法交换律》2b9b0274c1e085ecb5c62e89b35adc-ld