三年级数学
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A\u300190\u5929 B\u300191\u5929 C\u300192\u5929
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\u5bf9\u7684
(1)2根3厘米和2根2厘米
(2)2根3厘米和2根4厘米
(3)2根4厘米和2根2厘米
(2)4根4厘米
(3)4根3厘米
2.
2种拚法
(1)拚成"目"字形,周长是(1+4)×2=10厘米
(2)拚成"田"字形,周长是(2+2)×2=8厘米
3.
(1）1(米）-9（分米）=1(分米)
（2）1(米)-99(厘米)=1(厘米)
(3)1(分米)-9(厘米)=1(厘米)
(4)30(分钟)+30(分钟)=1(小时)
1. 2种，4根3厘米长的小棒12CM，4根4厘米长的小棒16CM 2. 2种 成条的10CM，田字的8CM。3.《1》CM MM MM （2）M CM CM（3）M dm dm (4)分钟 分钟 时
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绛旓細(3)鑳界啛缁冨畬鎴愪袱浣嶆暟銆佷笁浣嶆暟鐨勮繛缁繘浣嶅姞娉曠殑璁＄畻,骞惰兘瑙ｅ喅鐩稿叧鐨勫疄闄呴棶棰樸(4)鑳界粨鍚堝叿浣撴儏鍐佃繘琛屼及绠,閫愭鎺屾彙浼扮畻鐨勫熀鏈柟娉,鍏绘垚瀵硅绠楃粨鏋滅殑澶ц嚧鑼冨洿杩涜浼拌鐨勪範鎯2銆佸噺娉:(1)鑳戒粠瀹為檯鐨勬儏澧冧腑鎻愬彇鏈夌敤鐨鏁板淇℃伅,鑳芥牴鎹俊鎭彁鍑烘伆褰撶殑鏁板闂銆(2)鍦ㄨВ鍐抽棶棰樼殑杩囩▼涓粡鍘嗕及绠楃殑杩囩▼,骞堕愭瀛︿細鍚堢悊銆...
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绛旓細灏忓鏁板鍏紡锛1銆侀暱鏂瑰舰鐨勫懆闀=锛堥暱+瀹斤級脳2 C=(a+b)脳2 2銆佹鏂瑰舰鐨勫懆闀=杈归暱脳4 C=4a 3銆侀暱鏂瑰舰鐨勯潰绉=闀棵楀 S=ab 4銆佹鏂瑰舰鐨勯潰绉=杈归暱脳杈归暱 S=a.a= a 5銆佷笁瑙掑舰鐨勯潰绉=搴暶楅珮梅2 S=ah梅2 6銆佸钩琛屽洓杈瑰舰鐨勯潰绉=搴暶楅珮 S=ah 7銆佹褰㈢殑闈㈢Н=锛堜笂搴+涓嬪簳锛壝楅珮梅2 ...
