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1
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2
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3
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銆?/p>
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鑱旀兂
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4
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5
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棰勪範瀵煎
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瀛︿竴瀛︼細
1
闃呰鏁欐潗
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鍔ㄨ剳绛?/p>
鈥?/p>
锛屽洖绛斾笅鍒楅棶棰?/p>
锛?/p>
1
锛?/p>
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锛?/p>
2
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a+(b+c)= ___________;a+(b-c)= ___________
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3
锛?/p>
绗紙
2
锛夊皬棰樹腑锛岀瓑寮忓乏杈逛笌鍙宠竟鏈変簺浠�涔堝彉鍖栵紵
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4
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5
锛?/p>
鐢ㄥ幓鎷彿鐨勬柟娉曞寲绠�锛?/p>
13+(7-5)= __________=__________
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9a+(6a-a)= __________=__________
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2
闃呰鏁欐潗
P72鈥?/p>
璁竴璁?/p>
鈥?/p>
鍜?/p>
鈥?/p>
鍔ㄨ剳绛?/p>
鈥?/p>
锛屽洖绛斾笅鍒楅棶棰?/p>
锛?/p>
1
锛?/p>
3
鐨勭浉鍙嶆暟鏄?/p>
_______
锛?/p>
-
鐨勭浉鍙嶆暟鏄?/p>
_______
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a+b
鐨勭浉鍙嶆暟
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鐨勭浉鍙?/p>
鏁版槸
_______
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2
锛夊噺娉曠殑娉曞垯锛?/p>
锛?/p>
3
锛?/p>
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a-(b-c)=a+(-b+c)=
;
a-(-b-c)=a+(b+c)=
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4
锛?/p>
绗紙
3
锛夊皬棰樹腑锛岋紝绛夊紡宸﹁竟涓庡彸杈规湁浜涗粈涔堝彉鍖栵紵
锛?/p>
5
锛夋嫭鍙峰墠鏄?/p>
鈥?/p>
-
鈥?/p>
鍙凤紝鎬庢牱鍘绘嫭鍙凤紵
锛?/p>
6
锛?/p>
鐢ㄥ幓鎷彿鐨勬柟娉曞寲绠�锛?/p>
13-(7-5)= __________=__________
锛?/p>
9a-(6a-a)= __________=__________
銆?/p>