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4
5
×15=
6
7
÷
2
7
=
 
1
2
÷50%=
8×25%=
4
21
×0×
10
11
=
1
5
-
1
7
=
0.5+
1
4
=
5
8
×
8
7
=
9
10
÷3=
1
3
-
1
5
)×30=
分析:本题根据分数乘法,除法,加法,减法的运算法则计算即可.(
1
3
-
1
5
)×30可根所乘法分配律进行计算.
解答:
解:
4
5
×15=12,
6
7
÷
2
7
=3,
 
1
2
÷50%=1,
8×25%=2,
4
21
×0×
10
11
=0,
1
5
-
1
7
=
2
35
0.5+
1
4
=0.75,
5
8
×
8
7
=
5
7
9
10
÷3=
3
10
1
3
-
1
5
)×30=4.
点评:完成本题要细心,注意通分约分.同时含有分数与小数或百分数的算式要注意将它们化为统一的形式后再计算.
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