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:本題根據(jù)分?jǐn)?shù)乘法,除法,加法,減法的運(yùn)算法則計(jì)算即可.(
1
3
-
1
5
)×30可根所乘法分配律進(jìn)行計(jì)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.
點(diǎn)評(píng):完成本題要細(xì)心,注意通分約分.同時(shí)含有分?jǐn)?shù)與小數(shù)或百分?jǐn)?shù)的算式要注意將它們化為統(tǒng)一的形式后再計(jì)算.
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