請問如何計算:222*999呢?請告訴我快速的算法。
2005-08-29 17:04:47 · 5 個解答 · 發問者 美腿安懶人手作樂園 3 in 科學 ➔ 數學
就是222*(1000-1)=222*1000-222*1=221778
2005-08-29 17:05:26 · answer #1 · answered by Anonymous · 0⤊ 0⤋
這簡單,因為乘法有分配律,所以可以看成→
222*(1000-1)
乘開來之後→
222*1000-222
= 222000-222
= 221778
2005-08-29 17:26:26 · answer #2 · answered by smallwhite 7 · 0⤊ 0⤋
222*(1000-1)=>222000-222=221778
分配率= =
2005-08-29 17:07:15 · answer #3 · answered by jecint1707 2 · 0⤊ 0⤋
222*(1000-1)=222*1000-222*1=222000-222=221778
2005-08-29 17:06:01 · answer #4 · answered by ´WªN ± 7 · 0⤊ 0⤋
222 *(1000-1) ~
2005-08-29 17:05:28 · answer #5 · answered by ㄆㄆ 2 · 0⤊ 0⤋