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2
5
÷
1
7
×7=
2
5
×
×
.(判断对错)
分析:在计算
2
5
÷
1
7
×7时,先把除法改为乘法,从左往右依次运算.原题错误的原因在于没有按运算顺序进行计算.
解答:解:
2
5
÷
1
7
×7,
=
2
5
×7×7,
=
98
5

故答案为:×.
点评:此题主要考查分数四则混合运算的顺序.
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