51ⅹ59巧算 51X21巧算方法？
4.84\u00d75.9 0.59\u00d751.6\u7684\u5de7\u7b974.84\u00d75.9+0.59\u00d751.6
=4.84\u00d75.9+5.9\u00d70.1\u00d751.6
=5.9\u00d7(4.84+0.1\u00d751.6)
=5.9\u00d710
=60
\u6269\u5c55\u8d44\u6599\u5c0f\u6570\u4e58\u6cd5\u7684\u8fd0\u7b97\u6cd5\u5219\uff1a
1\u3001\u5148\u6309\u7167\u6574\u6570\u4e58\u6cd5\u7684\u6cd5\u5219\u6c42\u51fa\u79ef\uff1b
2\u3001\u518d\u770b\u88ab\u4e58\u6570\u548c\u4e58\u6570\u4e00\u5171\u6709\u51e0\u4f4d\u5c0f\u6570\uff0c\u5c31\u4ece\u79ef\u7684\u53f3\u8fb9\u8d77\u6570\u51fa\u51e0\u4f4d\uff0c\u70b9\u4e0a\u5c0f\u6570\u70b9\uff1b
3\u3001\u5982\u679c\u5c0f\u6570\u7684\u672b\u5c3e\u51fa\u73b00\u65f6\uff0c\u6839\u636e\u5c0f\u6570\u7684\u57fa\u672c\u6027\u8d28\uff0c\u628a\u5c0f\u6570\u672b\u5c3e\u76840\u5212\u53bb\u3002
51x21
\u89e3\uff1a=51x20+51x1
=1120+51
=1171
\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff0c\u671b\u91c7\u7eb3\uff01
图
这种类型在速算里叫：首同末合十
就是首位相同末位合成十
具体算法：把59凑成60，50×60
等于3000末位1×9=09就是3009
比如36×34
30×40=1200+4×6=1224
78×72=5600+2×8=5616
3009
解析：
51×59
=(50+1)×(60-1)
=3000+60-50-1
=3000+9
=3009
51×59=（50+1）×59=50×59+59=2950+59=3009
或者
51×59=51×（60-1）=51×60-59=3060-51=3009
51 * 59 = (5*6) * 100 + (1*9) = 3009
同理，
52 * 58 = (5*6) * 100 + (2*8) = 3016
53 * 57 = (5*6) * 100 + (3*7) = 3021
。。。。。。
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绛旓細宸х畻56脳51+112脳49-224脳12 瑙ｉ鎬濊矾:鍥涘垯杩愮畻瑙勫垯(鎸夐『搴忚绠,鍏堢畻涔橀櫎鍚庣畻鍔犲噺,鏈夋嫭鍙峰厛绠楁嫭鍙,鏈変箻鏂瑰厛绠椾箻鏂)鍗宠劚寮忚繍绠(閫掔瓑寮忚绠)闇鍦ㄨ鍘熷垯鍓嶆彁涓嬭繘琛 瑙ｉ杩囩▼:56脳51+112脳49-224脳12 =56脳(51+2脳49-4脳12)=56脳101 =56 脳100+56 =5600+56 =5656 ...
绛旓細(51脳65脳96)梅(17脳13脳12)=锛51梅17锛x锛65梅13锛墄锛96梅12锛=3x5x8 =120
绛旓細17x46+51x18 =17x46+17x3x18 =17x46+17x54 =17x(46+54)=17x100 =1700
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绛旓細102x30梅2梅6 =(102梅2)x(30梅6)=51x5 =255
