99x25十25(用分配律运算) 99x25一25用简便方法?
99X25\u534125\u7528\u7b80\u4fbf\u65b9\u6cd5\u600e\u4e48\u7b97\uff1f99\u00d725+25
\uff1d\uff0899+1\uff09\u00d725
\uff1d100\u00d725
=2500
\u8fd9\u662f\u4e58\u6cd5\u5206\u914d\u5f8b\u7684\u9006\u8fd0\u7b97
\u8fd9\u6837\u8ba1\u7b97\u6bd4\u8f83\u7b80\u4fbf\u3002
\u5e0c\u671b\u80fd\u591f\u5e2e\u5230\u4f60
\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65\u3002
\u5de7\u7b9799\u00d725-25
\u89e3\u9898\u601d\u8def\uff1a\u4e0d\u80fd\u8fdb\u884c\u7b80\u4fbf\u8fd0\u7b97\u7684\u6309\u987a\u5e8f\u8ba1\u7b97\uff0c\u7b80\u4fbf\u8fd0\u7b97\u6838\u5fc3\u662f\u8fd0\u7528\u52a0\u6cd5\u548c\u4e58\u6cd5\u5404\u79cd\u5b9a\u5f8b\u8fdb\u884c\u8ba1\u7b97\uff0c\u8ba1\u7b97\u51fa\u6574\u6570\u90e8\u5206\u65b9\u4fbf\u540e\u7eed\u8ba1\u7b97\u7684\u8fc7\u7a0b
\u89e3\u9898\u8fc7\u7a0b\uff1a
99\u00d725-25
=100\u00d725-25\u00d72
=2500-50
=2450
\u5b58\u7591\u8bf7\u8ffd\u95ee\uff0c\u6ee1\u610f\u8bf7\u91c7\u7eb3
=99×25+25×1
=(99+1)×25
=100×25
2500
绛旓細99脳25+25 =99脳25+25脳1 =锛99+1锛壝25 =100脳25 2500
绛旓細25+99X25绠渚胯繍绠 瑙o細閲囩敤鍒嗛厤寰嬶紝鍘熷紡=锛1+99锛墄25 =100x25 =2500
绛旓細鐪嬫垚1*25+99*25锛屽緱(1+99)*25=100*25=2500
绛旓細199脳25+25 =199脳25+25x1 杩愮敤涔樻硶鍒嗛厤寰 =锛199+1锛墄25 =200x25 =5000 绁濆涔犺繘姝ャ
绛旓細199*25锛濓紙200-1锛*25锛5000-25锛4975 銆
绛旓細=(299+1)脳25 =300脳25 =7500 涔樻硶鍒嗛厤寰銆
绛旓細杩愮敤浜涔樻硶鍒嗛厤寰
绛旓細25*99*25==25*(99+1) = 25*100=2500
绛旓細99脳25=锛100-1锛壝25=100脳25-1脳25=2500-25=2475锛涔樻硶鍒嗛厤寰
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