Besides, the author understood the rule of negative multiplication completely and studied the problem of permutation and combination deeply.

另外，萨玛·瓦尔完全理解了负数的乘法法则，并对排列组合问题也有充分的认识。

youdao

Besides, the author understood the rule of negative multiplication completely and studied the problem of permutation and combination deeply.

另外，萨玛·瓦尔完全理解了负数的乘法法则，并对排列组合问题也有充分的认识。

youdao