求解3.(2)🙏🙏

P180例5 A 3 右圖平行四邊形的兩條對角線相交於O點 AEL BD。若BD = 10,AE=3,求; (1) AOAB 的面積。 B. 1 15 i 2=7.5 (2) AOAD 的面積。

第1.(2)和2.3.圖形哪裡需要重畫？

點,依順時針 1 如下圖,已知三角板 ABC 停靠在直尺的邊上 方向翻滾,直到AC停靠在直尺的邊上;再以頂點點A為支點,依順時針方向翻 滾,直到AB 停靠在直尺的邊上;最後頂點B為支點,依順時針方向翻滚, 直到BC停靠在直尺的邊上。若在翻滾的過程中並未發生滑動的情形,試完成 下列尺規作圖: (1)作出頂點B、C最後停靠在直尺邊上的位置。 IB E E H F (2) PE ZPOQ= 2C-ZB R 8 Q

求解14.15.16.🙏🙏

求解1.(4)4.5.7.🙏🙏

求解

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ge/ogf7cs 上 In Christmas, ahotel is decorated With # lines of colour bulbs. There areJ bulbs in one line. Each bulb consumes 了units of electricity in one hour (a) 了Howmuch electricity does one line of bulbs consume in ahour? (b) How much electricity does the whole decoration consume in a hour? (c)。 IF婭三15,妃三10 and了三40, evaluate the amount ofelectricity consumed in one hour (6marks)