1
2
÷
7
8
×
4
5
=
1
2
÷
7
10
=
1
2
×
10
7
=
5
7
×
×
. (判斷對錯)
分析:算式
1
2
÷
7
8
×
4
5
,應(yīng)從左往右依次計算,不能先算乘法,故本題錯誤.
解答:解:
1
2
÷
7
8
×
4
5

=
1
2
×
8
7
×
4
5

=
4
7
×
4
5

=
16
35

故答案為:×.
點評:此題主要考查學(xué)生對分數(shù)四則混合運算順序的掌握情況.
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