题目内容
6.7-（5.7-0.9）用简便方法计算是6.7-5.7-0.9=0.1．
错误
分析：6.7-（5.7-0.9），根据减法的运算性质：a-（b-c）=a-b+c，据此简算．
解答：6.7-（5.7-0.9），
=6.7-5.7+0.9，
=1+0.9，
=1.9．
故答案为：×．
点评：此题考查的目的是理解掌握减法的运算性质，a-（b-c）=a-b+c，并且能够运用减法的运算性质进行简便计算．
分析：6.7-（5.7-0.9），根据减法的运算性质：a-（b-c）=a-b+c，据此简算．
解答：6.7-（5.7-0.9），
=6.7-5.7+0.9，
=1+0.9，
=1.9．
故答案为：×．
点评：此题考查的目的是理解掌握减法的运算性质，a-（b-c）=a-b+c，并且能够运用减法的运算性质进行简便计算．
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