Maths!!!

2008-11-23 9:20 pm

Use identities to find the values of the following.
1. (54)(46)

更新1:

54乘46

回答 (3)

2008-11-23 9:32 pm

✔ 最佳答案

將54同46拆為:(50+4)及(50-4)
可見算式變為(50+4)(50-4)
因此可運用公式(a+b)(a-b)--->(a^2)-(b^2)
即:(50^2)-(4^2)
=2500-16
=2484

參考: 自己

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2008-11-24 6:37 am

54=50+4
46=50+6
54X46
=(50+4)(50-4)
=50二次方-4二次方
=2500-16
=2484

參考: 快&準的我~~

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2008-11-23 9:25 pm

(54)(46)
=(50 4)(50-4)
=(50^2)-(4^2) *(a+b)(a-b)=(a^2)-(b^2)
=2500-16
=2484

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