25x(4十8)简便计算 25×(8+10)怎么简便运算
\u7528\u7b80\u4fbf\u8ba1\u7b97\u6cd525x\uff084\u53418\uff0925\u00d7(4+8)=25\u00d74+25\u00d78=100+200=300\u8fd9\u4e2a\u7b80\u4fbf\u65b9\u6cd5\u8ba1\u7b97\u9898\u8fd0\u7528\u5230\u4e86\u4e58\u6cd5\u5206\u914d\u5f8b\u6765\u8fdb\u884c\u8ba1\u7b97\uff0c\u5c31\u662fa\u00d7(b+c)=a\u00d7b+a\u00d7c\uff0c\u76f4\u63a5\u5e26\u8fd9\u4e2a\u516c\u5f0f\u5c31\u5f97\u5230\uff0c25\u00d74+25\u00d78\uff0c\u73b0\u5728\u5728\u6309\u7167\u56db\u5219\u6df7\u5408\u8fd0\u7b97\u7684\u987a\u5e8f\u8fdb\u884c\u8ba1\u7b97\uff0c\u56e0\u4e3a\u8fd9\u4e24\u4e2a\u56e0\u5f0f\u90fd\u662f\u7ecf\u5e38\u7528\u5230\u7684\u7b80\u4fbf\u65b9\u6cd5\u7684\u6570\u636e\uff0c\u6240\u4ee525\u00d74=100\uff0c25\u00d78=200\uff0c100+200=300\uff0c\u5229\u7528\u8fd9\u4e9b\u8fd0\u7b97\u5b9a\u5f8b\uff0c\u53ef\u4ee5\u8ba1\u7b97\u66f4\u52a0\u7b80\u4fbf\uff0c\u5e0c\u671b\u6211\u7684\u56de\u7b54\u80fd\u591f\u5e2e\u52a9\u5230\u4f60\uff0c\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65\uff0c\u5fc3\u60f3\u4e8b\u6210\uff0c\u4e07\u4e8b\u5982\u610f\uff0c\u656c\u8bf7\u91c7\u7eb3\uff0c\u8c22\u8c22\uff01
25\uff0820-2\uff09
=25\u00d720-25\u00d72
=500-50
=450
=25x4+25x8
=100+200
=300
25X(4+8)
=25x4十25X8
=10O十2Oo
=300
25ⅹ(4+8)
=25ⅹ4+25ⅹ8
=100+200
=300
乘法分配律为:两个数的和与一个数相乘,先将它们与这个数分别相乘,再相加,积不变.即:(a+b)×c=a×c+b×c.反过来则:a×c+b×c=(a+b)×c
25× ( 4+8)
= 25×4+25×8
= 100+200
= 300
绛旓細25x锛4+8锛=25x4+25x8 =100+200 =300
绛旓細25X(4鍗8)=25X4 + 25X8 =100+200 =300
绛旓細25脳锛4+8锛=25脳4锛1+2锛=100脳3=300 姝ら杩愮敤涔樻硶鍒嗛厤寰 绠渚胯绠椾腑鏈甯哥敤鐨勬柟娉曟槸涔樻硶鍒嗛厤寰嬨備箻娉曞垎閰嶅緥鎸囩殑鏄痑x(b+c)=axb+axc鍏朵腑a,b,c鏄换鎰忓疄鏁般傜浉鍙嶇殑锛宎xb+axc=ax(b+c)涔熷彨鎻愬彇鍏害鏁帮紝灏ゅ叾鏄痑涓巄浜掍负琛ユ暟鏃讹紝杩欑鏂规硶鏇存湁鐢ㄣ備篃鏈夋椂鐢ㄥ埌浜嗗姞娉曠粨鍚堝緥锛屾瘮濡俛+b+c锛宐鍜...
绛旓細25脳(4+8)=25脳4+25脳8=100+200=300杩欎釜绠渚挎柟娉曡绠楅杩愮敤鍒颁簡涔樻硶鍒嗛厤寰嬫潵杩涜璁$畻锛屽氨鏄痑脳(b+c)=a脳b+a脳c锛岀洿鎺ュ甫杩欎釜鍏紡灏卞緱鍒帮紝25脳4+25脳8锛岀幇鍦ㄥ湪鎸夌収鍥涘垯娣峰悎杩愮畻鐨勯『搴忚繘琛岃绠楋紝鍥犱负杩欎袱涓洜寮忛兘鏄粡甯哥敤鍒扮殑绠渚挎柟娉曠殑鏁版嵁锛屾墍浠25脳4=100锛25脳8=200锛100+200=300锛屽埄...
绛旓細鎶婃嫭鍙峰幓鎺夊氨鏄25脳4+25脳8. 绛変簬100+200=300 杩欓噷鍙渶瑕佽浣忕殑灏辨槸25脳4=100锛岃繖鏄竴涓浐瀹氱殑
绛旓細2銆佸垎缁勫噾鏁 鍔犳硶缁撳悎寰嬶細a+b+c=a+(b+c)=(a+b)+c锛涘噺娉曠殑鎬ц川锛歛-b-c=a-(b+c)銆3銆佹彁鍙栧叕鍥犳暟涓昏浣跨敤涔樻硶鍒嗛厤寰嬫彁鍙栧叕鍥犳暟锛宎 x (b卤c)=a x b卤a x c 鏈鐢ㄤ箻娉曞垎閰嶇巼杩涜璁$畻銆锛4+8 锛 脳25 = 4脳25+8脳25 = 100 +200 = 300 ...
绛旓細25脳4+25脳4+25脳4 =100+100+100 =300
绛旓細25脳4+25脳4脳2绛変簬鍙100+100脳2绛変簬2鍙100+200绛変簬3銆
绛旓細25脳锛4+8锛=32脳锛4.6875锛+32脳锛4.6875锛夌粡楠岀畻锛氱瓑寮忓乏杈圭殑绉=300 绛夊彿鍙宠竟鐨勫拰=300
绛旓細锛40+8锛x25 =40x25+8x25 =1000+200 =1200 浠ヤ笂灏辨槸绠渚鏂规硶銆