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7.23-(0.23-0.11)=7.23-________○________.

0.23    0.11
分析:根据减法的性质,一个数减去两个数的差,等于用这个数减去差里的被减数,再加差里的减数.由此可知:7.23-(0.23-0.11)=7.23-0.23+0.11.
解答:根据减法的性质可知:
7.23-(0.23-0.11)=7.23-0.23+0.11.
故答案为:0.23,+,0.11.
点评:此减法性质用字母表示为a-(b-c)=a-b+c或a+c-b,运用此性质进行计算时要注意符号的转换,+变成-,-变以加+.
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