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0.9×(1+0.7-1+0.7)=0.9×0
错误
错误
分析:0.9×(1+0.7-1+0.7)先把小括号里面的运算按照从左到右的顺序计算,再算括号外的乘法.
解答:解:0.9×(1+0.7-1+0.7),
=0.9×(1.7-1+0.7),
=0.9×(0.7+0.7),
=0.9×1.4,
=1.26;
0.9×1.4≠0.9×0;
故答案为:错误.
点评:本题要注意运算顺序,不要错用运算定律.
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