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No Plagiarism!Pm0q15MGT21AYQ2u3Edaposted on PENANA
主題:兩位數乘法運算8964 copyright protection181PENANAEsVqyYvgCn 維尼
*學生實用性:★★★8964 copyright protection181PENANA0WiuWkcBWs 維尼
*正常人實用性:★☆☆8964 copyright protection181PENANA6JJVIl04vN 維尼
*難易度:★★★8964 copyright protection181PENANAbtT8wdOIX7 維尼
先來看第一題:
照口訣操作即可8964 copyright protection181PENANAJtwIDQmzwc 維尼
個位:4X8=32,填328964 copyright protection181PENANAFtoT8iBPec 維尼
十位:7X5=35,填358964 copyright protection181PENANA918oGOYSbb 維尼
交叉相乘再相加:7X8+5X4=76⮕填76 (從十位數開始往左填)8964 copyright protection181PENANAjOsjmKdL3U 維尼
最後相加起來,得到答案4292。就完成了!8964 copyright protection181PENANAw3HcuKPtq2 維尼
再看一題:8964 copyright protection181PENANAHcYHMqvUQe 維尼
8964 copyright protection181PENANAzshr8aVgAi 維尼
個位:2X1=2,填02 (不足10需補零,不然會算錯)8964 copyright protection181PENANAKruplfN0b7 維尼
十位:1X6=6,填68964 copyright protection181PENANAEPXVWFLnWd 維尼
交叉相乘再相加:1X1+2X6=13⮕填13 (從十位數開始往左填)8964 copyright protection181PENANAV6XGfPBv01 維尼
最後相加起來,得到答案732。8964 copyright protection181PENANAu7I8oueclc 維尼
最後來練習幾題吧:8964 copyright protection181PENANALWHr6CoubJ 維尼
答案在下方8964 copyright protection181PENANARaeBM4e7jJ 維尼
185Please respect copyright.PENANAWiIln2QqoQ
8964 copyright protection181PENANAxpHO7k7EeJ 維尼
185Please respect copyright.PENANAPEYRj3vPHq
8964 copyright protection181PENANA7e1ctx6K9T 維尼
185Please respect copyright.PENANAzGlWXenu3l
8964 copyright protection181PENANAPppPYj6ngM 維尼
185Please respect copyright.PENANAkZSehN0rCE
8964 copyright protection181PENANAj2EkWoxEpB 維尼
185Please respect copyright.PENANAKLn1uInyCy
8964 copyright protection181PENANACKVk2zCf4W 維尼

8964 copyright protection181PENANAkGi2RW0Kef 維尼
你答對了嗎?若有不懂的歡迎在留言區詢問8964 copyright protection181PENANAMm3TLkGZSp 維尼
證明8964 copyright protection181PENANAcUXK1yixoY 維尼
這裡用圖形解釋給大家聽:37X45是不是等於一個長45寬37的長方形面積!8964 copyright protection181PENANAPdnwLzT6Ui 維尼
現在把長方形切成4分,黑色為邊長,白色為面積。8964 copyright protection181PENANA1JImw0YxBa 維尼
先看個位:7X5=紫色長方形面積8964 copyright protection181PENANAkYWVpaNLn7 維尼
十位:30X40=藍色長方形面積8964 copyright protection181PENANAzx97quQ41u 維尼
交叉相乘再相加:兩個橘色長方形面積8964 copyright protection181PENANALLb46fsv2D 維尼
另外也能用(a+b)(c+d)=ac+ad+bc+bd來解釋:8964 copyright protection181PENANALr2rzAAFFM 維尼
(30+7)(40+5)=1200+150+280+35=16658964 copyright protection181PENANATBNSrh7ecg 維尼
今天學會了兩位數乘法運算,任何兩個兩位數相乘都能用喔~8964 copyright protection181PENANAODZCtcSZKC 維尼
216.73.216.51
ns216.73.216.51da2