82x105的简便运算

---

82x105
=82x（100+5）
=82x100+82x5
=8200+410
=8610

---

82×105
=82×100+82×5
=8200+410
=8610

---

82可分为80与2所以82乘105等于80乘105加2乘105登于8400加210等于8610

---