简便计算75X25＋22X25-25 79x25+22x25-25的简便计算

79x25+22x25-25\uff0c\u7528\u7b80\u4fbf\u8fd0\u7b97\u6cd5\u3002

\uff0879+21\uff09\u00d725
=100\u00d725
=2500
\u5982\u5e2e\u5230\u4f60\uff0c\u8bf7\u70b9\u91c7\u7eb3\uff0c\u8c22\u8c22

\u56fe

请采纳

75×25+22×25-25
=75×25+22×25-25×1
=（75+22-1）×25
=96×5×5
=480×5
=2400
乘法结合律

解：
75X25＋22X25-25
=25（75+22-1）
=25X96
=25X（100-4）
=2500-100
=2400

19x75+23x25,鎬庝箞绠渚胯绠?
绛旓細浜诧紝绠渚鏂规硶濡備笅锛屽弬鑰冧竴涓嬪惂銆19x75+23x25 =19x(100-25)+23x25 =19x100-19x25+23x25 =1900+4x25 =1900+100 =2000

璁＄畻75x25鏃,鍙互鍏堢畻()x()=(),鍐嶇畻()x()=(),鏈鍚庣畻()+()=(),鎵浠75
绛旓細璁＄畻75x25鏃讹紝鍙互鍏堢畻锛72锛墄锛25锛=锛1800锛夛紝鍐嶇畻锛3锛墄锛25锛=锛75锛夛紝鏈鍚庣畻锛1800锛+锛75锛=锛1875锛夛紝鎵浠75脳25=锛1875锛

12x25+75x24绠渚胯绠鍏紡
绛旓細12*25+75*24 =3*4*25+3*25*4*6 =300+1800 =2100

杩愮敤绠渚鏂规硶75x29鍗29x25
绛旓細75x29鍗29x25 =29脳锛75+25锛=29脳100 =2900

绠渚胯绠75涔96鍗12x25
绛旓細绠渚胯绠杩囩▼濡備笅锛1銆佹彁鍙栧師寮忥細75x96+12x25 2銆佽绠楄繃绋嬶細=75x96+4x(3x25)=75x96+4x75 =75x锛96+4锛=75x100 =7500 3銆佽绠楃粨鏋滐細7500

绠渚胯绠75x27+19x25 璋㈣阿
绛旓細=75*2+75*25+19*25 =25*3*2+锛75+19锛*25 =25*锛6+94锛=25*100 =2500

鐢绠渚鏂规硶璁＄畻75x25鍗75x75?
绛旓細绛旀鏄: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

75x27+19x25鎬庝箞绠渚胯绠?
绛旓細瑙ｏ細鍙互宸у鍦拌繍鐢ㄤ箻娉曞垎閰嶅緥鍜岀粨鍚堝緥鏉ヨ繘琛绠绠锛屽叿浣撴楠よ鍙傝冨涓嬶細75x27+19x25 =25脳3脳27+19脳25 =25脳锛81+19锛=25脳100 =2500

38x25 +22x25 +60x75绠绠?
绛旓細=锛38+22锛x25+60x75 =60x25+60x75 =60x锛25+75锛=60x100 =6000

75x27+19x25鎬庝箞绠渚胯绠?
绛旓細鍥犱负75鍙互鐪嬩綔25脳3锛屾墍浠ュ彲浠ユ妸鐩稿悓鐨勬暟25鎻愬彇鍑烘潵瑙ｅ師寮=25脳3脳27+19脳25 =25脳锛3脳27+19锛=25脳锛81+19锛=25脳100 =2500 鎵浠ヨ棰樼瓟妗堝簲涓2500