题目内容

2.2+3.57= 27×
1
9
=
4
5
×
3
4
=
20×
1
4
=
1
4
×
2
3
×
1
5
=
1
2
×
1
3
=
6
7
×
1
3
=
1
6
×
4
7
=
5
16
×
18
15
=
1
3
×(1-
1
4
)=
分析:根据小数和分数加减乘除的计算方法进行计算.
解答:
解:2.2+3.57=5.77, 27×
1
9
=3,
4
5
×
3
4
=
3
5
20×
1
4
=5,
1
4
×
2
3
×
1
5
=
1
30
1
2
×
1
3
=
1
6
6
7
×
1
3
=
2
7
1
6
×
4
7
=
2
21
5
16
×
18
15
=
3
8
1
3
×(1-
1
4
)=
1
4
点评:口算时,注意运算符号和数据,然后再进一步计算.
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