有三个数4、0.8、1.25，请根据乘法运算定律编一道计算题，并说一说如何运用运算定律使计算简便 运用乘法运算定律计算，下面各题47×23+53乘23
\u4e58\u6cd5\u8fd0\u7b97\u5b9a\u5f8b\u662f\u4ec0\u4e48\uff1f\uff1f\uff1f\uff1f47x23+53x23
=\uff0847+53\uff09x23
=100x23
=2300
4x0.8x1.25
=4x1.25x0.8
=5x0.8
=4
4*0.8*1.25
=1.25*0.8*4
=1*4
=4
14xc/,vll 1
绛旓細(鐢佃剳鎶曞奖鍑虹ず)32脳1.25 (4+2)脳0.9 涓夈佹嫇灞曠粌涔 甯:鑰佸笀杩欓噷鏈変笁涓暟4銆0.8銆1.25璇蜂綘浠牴鎹箻娉曠殑杩愮畻瀹氬緥缂栧紡棰,骞惰涓璇村浣曡繍鐢ㄨ繍绠楀畾寰嬩娇璁＄畻绠渚裤 鍥涖佹荤粨鍏ㄨ,鍙嶆濅綋楠 甯:鍚屽浠,鎴戜滑浠婂ぉ瀛︿範浜嗕粈涔堝唴瀹?浣犳湁浠涔堟敹鑾? 浜斻佷綔涓 璇蜂綘杩愮敤姝ｇ‘鍚堢悊鐨勬柟娉曡繘琛岀畝渚胯绠 1銆佸繀鍋氶: (1) 102脳0.4...
绛旓細4.8*1.25=(4+0.8)*1.25=4*1.25+0.8*1.25=5+1=6
绛旓細1.25脳锛4+0.8锛夛紳1.25脳4+1.25脳0.8 锛5+1 锛6 绛旓細缁撴灉绛変簬6
绛旓細涔熸湁鏃剁敤鍒颁簡鍔犳硶缁撳悎寰嬶紝姣斿a+b+c锛宐鍜宑浜掍负琛ユ暟锛屽氨鍙互鎶奲鍜宑缁撳悎璧锋潵锛屽啀涓巃鐩镐箻銆傚灏嗕笂寮忎腑鐨+鍙樹负x锛岃繍鐢ㄤ箻娉曠粨鍚堝緥涔熷彲绠渚胯绠椼備箻娉曠粨鍚堝緥涔樻硶缁撳悎寰嬩篃鏄仛绠渚胯繍绠楃殑涓绉嶆柟娉曪紝鐢ㄥ瓧姣嶈〃绀轰负(a脳b)脳c=a脳(b脳c)锛屽畠鐨勫畾涔夛紙鏂规硶锛夋槸锛涓変釜鏁鐩镐箻锛屽厛鎶婂墠涓や釜鏁扮浉涔橈紝鍐嶅拰...
绛旓細涓変釜鏁鐩镐箻鏃讹紝鍙换鎰忎氦鎹袱涓洜鏁扮殑浣嶇疆锛岀Н涓嶅彉锛屽锛歛脳b脳c=b脳a脳c=a脳c脳b 浣滅敤锛氬畠鍙互鏀瑰彉涔樻硶杩愮畻褰撲腑鐨勮繍绠楅『搴忥紝浣嗕笉鏀瑰彉杩愮畻鐨勬渶缁堢粨鏋溿傚湪鏃ュ父鐢熸椿涓紝涔樻硶浜ゆ崲寰嬪線寰鍙互绠鍖栭棶棰樼殑璁＄畻銆傚簲鐢細锛1锛夊洜鏁颁腑闂存湁闆舵垨鑰呮湯灏炬湁闆朵氦鎹綅缃浉涔樹竴鑸儏鍐典笅鍙互绠渚胯绠楄繃绋嬨傦紙2锛夊叾涓竴涓...
绛旓細=1.25梅4/0.8 =1.25脳0.8/4 =1/4 =0.25 瑙ｆ硶鍒嗘瀽锛氶櫎娉曡浆鍖栦负涔樻硶锛岄櫎浠ヤ竴涓暟绛変簬涔樹互杩欎釜鏁扮殑鍊掓暟锛屾墍浠ュ氨鍙互寰堝揩寰楀嚭缁撴灉銆
绛旓細12.5脳4.8鍙互鍒╃敤涔樻硶鍒嗛厤寰嬪拰鐗规畩鏁板艰繘琛岀畝渚胯繍绠楋細1銆佺壒娈婃暟鍊硷細1.25脳4=5锛1.25脳8=10銆2銆佸叿浣撹绠楄繃绋嬩负锛12.5脳4.8 =12.5脳锛4+0.8锛=12.5脳4+12.5脳0.8 =50+10 =60
绛旓細0.25X3.2X1.25鐨勭畝渚胯繍绠楄繃绋嬪涓嬶細0.25x3.2x1.25 =0.25脳4脳0.8脳1.25 =1脳1 =1 鎵浠0.25X3.2X1.25鐨勭畝渚胯繍绠楃殑鏈缁堢粨鏋滄槸1銆
绛旓細鎮ㄥソ锛屽緢楂樺叴鍥炵瓟鎮ㄧ殑闂銆傞氬父鎴戜滑鎵璇寸殑绠渚胯绠楋紝涓鑸儏鍐典笅閮芥槸鎸囩殑鍑戞垚鏁村崄鎴栬呮暣鐧惧拰鏁村崈鐨勮绠椼傞偅涔堟垜浠煡閬25*4=100锛125*8=1000锛2*5=10绛夊父瑙佸舰寮忋傛墍浠ユ垜浠氨瑕佹兂鍔炴硶寰杩欎簺鏁板瓧涓婇潰鍘婚潬杩戙3.2*0.25*1.25=4*0.8*0.25*1.25=4*0.25*锛0.8*1.25锛=1*1=1銆
绛旓細(8)鐢叉暟闄や互涔欐暟鐨勫晢鏄4/5,鐢叉暟涓庝箼鏁扮殑姣旀槸1.25銆傝繖涓棶棰橀渶瑕佹垜浠牴鎹敳鏁伴櫎浠ヤ箼鏁扮殑鍟嗭紝鏉ユ眰鍑虹敳鏁颁笌涔欐暟鐨勬瘮銆傚凡鐭ョ敳鏁伴櫎浠ヤ箼鏁扮殑鍟嗭紝鏍规嵁鐢叉暟闄や互涔欐暟鐨勫晢锛屽彲寰楀埌鐢叉暟涓庝箼鏁扮殑姣旓細1/0.8=1.25銆傛墍浠ワ紝鐢叉暟涓庝箼鏁扮殑姣斾负1.25銆
