Question

40×39/41这题怎么简便计算？

40×39/41这一题怎么简便计算

Answer 1

40 × 39/41
=(41-1) × 39/41
=41× 39/41 - 1×39/41
=39- 39/41
=38 又 2/41
备注：将40用含有41的式子表示为41-1，再利用乘法分配律进行简便计算即可。

Answer 2

原式＝（41-1）×39/41
＝41×39/41-1×39/41
＝39-39/41
＝38又2/41

Answer 3

简便计算

---

=41*39/41-39/41

=39-39/41

=38又2/41

Answer 4

40×39／41
＝（41－1）×39／41
＝41×39／41－1×39／41
＝39－39／41
＝38又2／41

Answer 5

=（41一1）X39/41
=41×39/41一1×39/41
=39一39/41
=38又41分之2