89X23-23的简便算法是什么？小学四年级的一道数学题。 小学四年级的数学题..用简便方法计算
\u7b80\u4fbf\u7b97\u6cd5\u6570\u5b66\u9898\u56db\u5e74\u7ea7\u8131\u5f0f\u8ba1\u7b97\u516c\u5f0f\uff1f\u4e00\u3001\u8fd0\u7b97\u5b9a\u5f8b\u5fc5\u987b\u5f04\u6e05
\u52a0\u6cd5\u4ea4\u6362\u5f8b a+b = b+ a
\u4f8b\uff1a25+37=37+25
\u52a0\u6cd5\u7ed3\u5408\u5f8b a+b+c=a+(b+c)
\u4f8b\uff1a25+37+63=25+(37+63)
\uff08\u6269\u5c55\uff09 a\uff0db\uff0dc=a-(b+c)
\u4f8b\uff1a125\uff0d37\uff0d63=25\uff0d(37+63)
a\uff0db+c=a\uff0d(b\uff0dc)
\u4f8b\uff1a300\uff0d159+59=300\uff0d(159\uff0d59)
\u4e58\u6cd5\u4ea4\u6362\u5f8b a\u00d7b\u00d7c=a\u00d7c\u00d7b
\u4f8b\uff1a25\u00d79\u00d74=25\u00d74\u00d79
\u4e58\u6cd5\u7ed3\u5408\u5f8b a\u00d7b\u00d7c=(a\u00d7c) \u00d7b
\u4f8b\uff1a128\u00d73\u00d78=(125\u00d78) \u00d73
\u4e58\u6cd5\u5206\u914d\u5f8b a\u00d7(b+c)=a\u00d7b+a\u00d7c
\u4f8b\uff1a8\u00d7(125+25)=8\u00d7125+8\u00d725
\uff08\u6269\u5c55\uff09a\u00f7b\u00f7c=a\u00f7\uff08c\u00d7b\uff09
\u4f8b\uff1a100\u00f75\u00f72=100\u00f7\uff085\u00d72\uff09
a\u00f7\uff08c\u00d7b\uff09= a\u00f7b\u00f7c
\u4f8b\uff1a100\u00f7\uff085\u00d72\uff09 =100\u00f75\u00f72
\u4e8c\u3001\u5fc5\u987b\u80cc\u4e0b\u6765\u7684\u51e0\u4e2a\u7b97\u5f0f
2\u00d75=10 2\u00d750=100 4\u00d725=100 8\u00d725=200
12\u00d75=60 8\u00d7125=1000
37\u00d73=111 333=111\u00d73 999=333\u00d73=111\u00d79
\u4e09\u3001\u52a0\u6cd5\u7b80\u4fbf\u8ba1\u7b97\u8bad\u7ec3
1\u3001\u51d1\u6574\u6cd5\u7b80\u4fbf\u8ba1\u7b97\uff1a
\u4f8b\uff1a\uff0828+36\uff09+64
=28+\uff0836+64\uff09
=28+100
=128
182+18+276+24
=\uff08182+18\uff09+\uff08276+24\uff09
=200+300
=500
\u5c0f\u7ed3\uff1a\u591a\u6570\u76f8\u52a0\uff0c\u770b\u5c3e\u6570\u662f\u5426\u80fd\u51d1\u6210\u6574\u6570\uff0c\u5c06\u51d1\u6210\u6574\u6570\u7684\u914d\u5bf9\u5148\u52a0\u3002
\u7ec3\u4e60\uff1a
91\uff0b89\uff0b11\u3000
78\uff0b46\uff0b154
168\uff0b250\uff0b32
85\uff0b15\uff0b41\uff0b59
364+97+636+1803
2\u3001\u8865\u5dee\u6cd5\u7684\u7b80\u4fbf\u8ba1\u7b97\uff1a
\u4f8b\uff1a99+198+397+296
=100-1+200-2+400-3+300-4
=100+200+400+300-1-2-3-4
=1000-10
=990
\u5c0f\u7ed3\uff1a\u8ba1\u7b97\u4e2d\u5148\u770b\u6709\u4e0e\u6574\u6570\u6700\u63a5\u8fd1\u7684\u6570\u5b57\uff0c\u8865\u5dee\u540e\u8ba1\u7b97\u3002
\u7ec3\u4e60\uff1a
999+9999+99+9
99+88+77+66
2\u3001\u7b80\u4fbf\u8fd0\u7b97\u4e00\uff1a
\u4f8b\uff1a\uff084+2\uff09\u00d725
=4\u00d725+2\u00d725
=100+50
=150
\u5c0f\u7ed3\uff1a\u6ce8\u610f\u5fc5\u987b\u80cc\u4e0b\u6765\u7684\u7b97\u5f0f\u4e2d\u7684\u6570\u5b57\u662f\u5426\u5728\u7b97\u5f0f\u4e2d\u51fa\u73b0\uff0c\u5c3d\u91cf\u6c42\u6574\u6570\u518d\u8ba1\u7b97\u3002
\u7ec3\u4e60\uff1a
(24\uff0b8)\u00d7125
25\u00d7(20\u20144)
3\u3001\u7b80\u4fbf\u8fd0\u7b97\u4e8c\uff1a
\u4f8b\uff1a45\u00d79\uff0b55\u00d79
=\uff0845+55\uff09\u00d79
=100\u00d79
=900
8\u00d727\uff0b73\u00d78
=8\u00d7\uff0827+73\uff09
=8\u00d7100
=800
\u5c0f\u7ed3\uff1a\u5728\u4e24\u7ec4\u4e58\u6cd5\u76f8\u52a0\u7684\u7b97\u5f0f\u4e2d\uff0c\u770b\u662f\u5426\u6709\u76f8\u540c\u6570\u5b57\u51fa\u73b0
\u7ec3\u4e60\uff1a
14\u00d79+9\u00d736
28\u00d719+28\u00d781
9\u00d747+53\u00d79
8\u00d7\uff08125+25+5\uff09
\uff081000\u20143\uff09\u00d78
125\u00d713\u2014125\u00d75
4\u3001\u7b80\u4fbf\u8fd0\u7b97\u4e09\uff1a
\u4f8b\uff1a45\u00d790\uff0b550\u00d79
=45\u00d79\u00d710+550\u00d79
=450\u00d79+550\u00d79
=\uff08450+550\uff09\u00d79
=1000\u00d79
=9000
37\u00d712\uff0b3.7\u00d7880
=37\u00d712\uff0b3.7\u00d710\u00d788
=37\u00d712\uff0b37\u00d788
=37\u00d7(12\uff0b88)
=37\u00d7100
=3700
\u5c0f\u7ed3\uff1a\u4e24\u4e2a\u56e0\u6570\u4e00\u4e2a\u6269\u592710\u500d\uff0c\u53e6\u4e00\u4e2a\u7f29\u5c0f10\u500d\uff0c\u79ef\u4e0d\u53d8\u3002\uff08\u53ef\u7c7b\u63a8\uff09
\u7ec3\u4e60\uff1a
0.55\u00d7200\uff0b55\u00d74
99999\u00d77+11111\u00d737
5\u3001\u7b80\u4fbf\u8fd0\u7b97\u56db\uff1a
\u4f8b\uff1a999\u00d77
=\uff081000-1\uff09\u00d77
=1000\u00d77-7
=7000-7
=6993
102\u00d743
=\uff08100+2\uff09\u00d743
=100\u00d743+2\u00d743
=4300+86
=4386
\u7ec3\u4e60\uff1a
69\u00d7101
1111\u00d79999
\u56db\u3001\u51cf\u6cd5\u6027\u8d28\u548c\u9664\u6cd5\u6027\u8d28
1\u3001\u51cf\u6cd5\u7b80\u4fbf\u8ba1\u7b97\uff1b
\u4f8b\uff1a1035-235-497
=(1035-235\uff09-497
=800-497
= 303
1275-164-36
=1275-\uff08164+36\uff09
=1275-200
=1075
\u5c0f\u7ed3\uff1a\u51cf\u6cd5\u9898\u770b\u5c3e\u6570\u662f\u5426\u76f8\u540c\uff0c\u53ef\u4ee5\u5148\u51cf\uff1b\u8fde\u51cf\u9898\u53ef\u4ee5\u5148\u770b\u540e\u4e24\u6570\u662f\u5426\u53ef\u4ee5\u76f8\u52a0\u6c42\u6574\u3002
\u7ec3\u4e60\uff1a
436-236-150
1245-\uff08245+673\uff09
480-82-18
673-84-71-45
2\u3001\u9664\u6cd5\u7b80\u4fbf\u8ba1\u7b97\uff1b
\u4f8b\uff1a81\u00f73\u00f73
=81\u00f73\u00d73
=81\u00f79
=9
210\u00f7\uff087\u00d76\uff09
=210\u00f77\u00f76
=30\u00f76
=5
\u7ec3\u4e60\uff1a
64\u00f72\u00f74
420\u00f7\uff087\u00d76\uff09
\u7efc\u5408\u7ec3\u4e60\uff1a
1184\uff0d68\uff0d42
5347\u4e00347\u4e00972
3576\uff0d133\uff0d67
1054\uff0d13\uff0d54
25\u00d74\u00d76
7\u00d78\u00d7125
4\u00d77\u00d725
234\u00d725\u00d74
37\u00d72\u00d7125\u00d725\u00d75\u00d74\u00d78
125\u00d732\u00d72\u00d725\u00d75
4444\u00d725
98+265+202
273\u201473\u201427
250\u00d713\u00d74
3200\u00f74\u00f75
88\u00d7125
99\u00d738+38
17\u00d723\u201423\u00d77
72\u00d7125
24\u00d7125
99\u00d756
125\u00d7\uff088+10\uff09
199\u00d756+56
333\u00d7774+113\u00d7666
999\u00d7999+999
25+199*25 99*13+13 104*28
=25*1+25*199 =99*13+13*1 =(100+4)*28
=25*(1+99) =13*(99+1) =100*28+4*28
=25*200 =13*100 =2800+112
=5000 =1300 =2912 \u5e0c\u671b\u53ef\u4ee5\u5e2e\u5230\u4f60O(\u2229_\u2229)O~ \u4ee5\u540e\u8981\u81ea\u5df1\u505a\u5f88\u5bb9\u6613\u7684
89×23-23
=23×(89-1)
=23×88
=23×90-23×2
=20×90+3×90-46
=1800+270-46
=2070-46
=2024
很简便了，希望能帮助到您，望采纳，谢谢
89X23-23
=23×(89-1)
=23×88
=2024
89×23-23
=89×23-23×1
=23×（89-1）
=23×88
=2024
祝你学习进步哈！
89×23-23
100*23-11*23-23？记得11乘以两位数挺方便的…
绛旓細绠渚胯绠杩囩▼鏂规硶濡備笅 瑙:78+89脳22 =78+锛90-1锛壝22 =78+90脳22-22脳1 =78+1980-22 =2058-22 =2036
绛旓細123x89-89x23鐨绠绠 123x89-89x23 =锛123-23锛*89 =100*89 =8900
绛旓細299脳23+23=绛変簬锛岀瓑浜庝簩鐧句節鍗佷節鍔犱竴鐨勫拰涔浜屽崄涓锛岀瓑浜300脳23锛岀瓑浜庯紝绛変簬6900锛
绛旓細89x23+89x76+89 =89x锛23+76+1锛=89x100 =8900 鏈嬪弸锛岃閲囩撼姝ｇ‘绛旀锛屼綘浠彧鎻愰棶锛屼笉閲囩撼姝ｇ‘绛旀锛屽洖绛旈兘娌℃湁鍔诧紒锛侊紒鏈嬪弸锛岃銆愰噰绾崇瓟妗堛戯紝鎮ㄧ殑閲囩撼鏄垜绛旈鐨勫姩鍔涳紝濡傛灉娌℃湁鏄庣櫧锛岃杩介棶銆傝阿璋
绛旓細杩欓亾棰樿嚜鐒舵槸鏈绠渚跨畻娉鐨勶紝鍙互杩欐牱鏉ヨ繘琛岃绠 19脳23-23-9=18脳23-9锛屼簬2脳9脳23-9 绛変簬46脳9-9锛岀瓑浜45脳9
绛旓細89x21绾︾瓑浜庡灏 89绾︾瓑浜90 21涔熺瓑浜20 鎵浠89X21绾︾瓑浜1800 绾︾瓑浜庡氨鏄ぇ绾﹀灏戠殑鎰忔濓紝鏄竴涓及璁＄殑鏁板瓧锛屾寜鍥涜垗浜斿叆婕绠楁硶杩涜璁＄畻銆89x23 绾︾瓑浜庡灏 89x23 绾︾瓑浜1800 89鎺ヨ繎90 23鎺ヨ繎20 89x23鈮90x20=1800 89X20绾︾瓑浜庡灏 绛旀锛 绾︾瓑浜1800 瑙ｉ锛 89X20=1780锛屾牴鎹...
绛旓細鍥炵瓟锛氱瓑浜23鈺(87-6+19)=23鈺100=2300
绛旓細浜诧紝鍙互浣跨敤涔樻硶鍒嗛厤寰嬶細123x89-89x23 =锛123-23锛墄89 = 100x89 = 8900 婊℃剰璇烽噰绾冲摝锛
绛旓細瑕佹槸19脳23-23脳9 =23脳锛19-9锛=23脳10 =230 杩欏紡瀛愭剰涔変笉澶 19脳23-23-9 =23脳锛19-1锛-9 =23脳18-9 =23脳锛20-2锛-9 =460-46-9 =414-9 =405
绛旓細99x23 =23x(100-1)=230O-23 =2277
