6.7-（5.7-0.9）用簡便方法計算是6.7-5.7-0.9=0.1．
錯誤
分析：6.7-（5.7-0.9），根據(jù)減法的運算性質(zhì)：a-（b-c）=a-b+c，據(jù)此簡算．
解答：6.7-（5.7-0.9），
=6.7-5.7+0.9，
=1+0.9，
=1.9．
故答案為：×．
點評：此題考查的目的是理解掌握減法的運算性質(zhì)，a-（b-c）=a-b+c，并且能夠運用減法的運算性質(zhì)進行簡便計算．
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6.7-（5.7-0.9）用簡便方法計算是6.7-5.7-0.9=0.1．
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