問野 數學數學~~~勁急!!!!!!

2007-10-18 3:24 am
(5-2+12-2) ÷ 13-2
要求過程 愈長細愈好~~~

回答 (4)

2007-10-18 3:35 am
 (5-2+12-2) ÷ 13-2
=(〔-25〕+〔-144〕)÷(-169)
=(-169)÷(-169)
=1


(我唔係好知道呢條題係咪咁計......)
2007-10-18 3:34 am
(5的-2之方+12的-2次方)除以13的-2次方

(5-2+12-2) ÷ 13-2
= (1/25 + 1/144) ÷ (1/169)
= 28561/3600
= 7.93361

2007-10-17 19:38:01 補充:
回答#1 & #2... 問題是 "5的 -2 次方+12的 -2 次方" or "5的 2 次方+12的 2 次方"?
2007-10-18 3:34 am
(5^2+12^2)/13^-2
=(5^2+12^2)÷13^-2
=(5^2+12^2)÷1÷13^2
=(5^2+12^2)÷13^2
=(5+12)^2/(13)^2
=5+12/13
=17/13
2007-10-18 3:33 am
(52+122) ÷ 132

=(25+144) ÷169

=169 ÷169

=1


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