用简便方法计算75x25十75x75? 简便运算75x25+25一75
75x25+75+75x74\u7684\u7b80\u4fbf\u65b9\u6cd5\uff1f75x25+75+75x74
=75x\uff0825+1+74\uff09
=75x100
=7500
\u7b80\u4fbf\u8fd0\u7b9775x25+25\u4e0075
\u89e3\uff1a\u6839\u636e\u5206\u914d\u5f8b\u7684\u8fd0\u7528\uff0c
\u539f\u5f0f=25x\uff0875+1\uff09-75
=25x76-75
=25x4x19-75
=1900-75
=1825
解答思路:用乘法结合律,25+75可以直接看出来等于100,而任何事乘100就是末尾加两个0。75×100=7500。
75×25+75×75
= 75×(75+25)
= 75×100
= 7500
75×25+75×75
= 75×(75+25)
= 75×100
= 7500
绛旓細75*25绠渚胯绠楁柟娉 =75*20+70*5+5*5 =1500+350+25 =1850+25 =1875
绛旓細75x25鐨勭畝渚胯繍绠楋細75x25= (80-5)x25= 80x25-5x25= 20x4x25-(4+1)x25= 2000-4x25-1x25= 2000-100-25= 1900-25= 1875 浠ヤ笂灏辨槸绠渚胯繍绠楃殑杩囩▼銆
绛旓細瑙g瓟鎬濊矾:鐢ㄤ箻娉曠粨鍚堝緥锛25+75鍙互鐩存帴鐪嬪嚭鏉ョ瓑浜100锛岃屼换浣曚簨涔100灏辨槸鏈熬鍔犱袱涓0銆75脳100锛7500銆
绛旓細75鍗25x25 =25x3+25x25 =25x(3+25)=25x28 =25x4x7 =100x7 =700
绛旓細75脳19+75 =75脳19+75脳1 =75脳锛19+1锛=75脳2 =1500 绠渚胯繍绠楀畾寰 1銆鍔犳硶浜ゆ崲寰锛氫笁涓暟鐩稿姞锛屼氦鎹袱涓姞鏁扮殑浣嶇疆锛屽拰涓嶅彉銆傚叕寮忥細a锛媌+c= a+c+b 姝ゆ柟娉曞湪绠渚胯繍绠楄繃绋嬩腑锛屽叧閿湪浜庝氦鎹㈠悗鐨勪袱涓暟鑳藉噾鏁淬2銆佸姞娉曠粨鍚堝緥锛氫笁涓暟鐩稿姞锛屽厛鎶婂墠涓や釜鏁扮浉鍔狅紝鎴栬呭厛鎶婂悗涓や釜鏁扮浉鍔狅紝...
绛旓細浣犲ソ锛佹牴鎹洓鍒杩愮畻閲岀殑涔樻硶缁撳悎鐜囷紝杩欓亾棰樼殑瑙i杩囩▼鏄5✘锛25+75锛=5✘100=500锛屽笇鏈涙垜鐨勮В棰樿繃绋嬭兘甯埌浣!
绛旓細鏈绠渚胯繍绠濡備笅锛35脳75+25脳75 =75x(35+25)=75x60 =4500
绛旓細75x3鍗75鍗75=25脳3脳3+25脳3+25脳3=25脳(9+3+3)=25脳10+25脳5=250+125=375
绛旓細75X28鍗75X95 =75*(28+95)=75*(100+20+3)=7500+1500+225 =9225
绛旓細鍥撅紝鐩存帴璁$畻锛屽緢绠鍗曘