作者Honor1984 (奈何上天造化弄人?)
看板Math
标题Re: [中学] 国中第五册下复习
时间Wed May 1 23:30:05 2024
※ 引述《jjjordan0512 (异形)》之铭言:
: https://i.imgur.com/6WiJIjd.jpeg
: 1跟2(2)
算点比较以意思的
1.
(9a - 9 + 5)^2 - 10(9a + 9 - 4) - 47
= [9的倍数] + 25 + 40 - 47
= [9的倍数] + 9*2
所以是9的倍数
2.
EF = 4 + 4 - 5 = 3
=> GE^2 + GF^2 = 9
: https://i.imgur.com/W92y2xH.jpeg
: 10,11,12
: 如图,求解谢谢
10.
√[5^2 + 7^2] / √2
11.
(3 + 4 + 5)k = 72 => k = 6
面积 = (1/2)*3*4*6^2
12.
R^2 = (4 - R)^2 + 9 => R = 25/8
FG = 4 *2/3 = 8/3
OG = FO - FG = 11/24
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