100x79+184x21+84x29解:巧算=100x79+(100+84)x21+84x29=100x79+100x21+84x21+84x29=100x(79+21)+42x42+42x58 乘法分配率=100x100+42x(42+58)乘法分配率=10000+42x100=10000+4200=14200祝学习进步。
分配律的律写错了!!!不是率而是律!!!