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6.7-(5.7-0.9)用简便方法计算是6.7-5.7-0.9=0.1.
×
×
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:解: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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