直接寫出得數(shù).
1
4
=
3
5
×3=
5
8
×4=
1
3
+
3
4
)×12=
4
9
×
2
3
=
4
9
+
2
3
=
2
3
÷
3
2
=
3
4
+
1
4
×3=
12×
3
4
=
12÷
3
4
=
12+
3
4
=
1
3
×
1
4
÷
1
3
×
1
4
=
2.44-0.1= 4.2÷0.3= 15×30%=
5
6
÷
3
5
÷
5
2
=
0.52=
1
5
+
1
4
=
12-
3
4
=
40÷40%=
分析:本題根據(jù)分?jǐn)?shù)加法、減法、乘法、除法,小數(shù)的加法、除法的運(yùn)算法則計(jì)算即可.
1
3
+
3
4
)×12可據(jù)乘法分配律計(jì)算,
1
3
×
1
4
÷
1
3
×
1
4
可根據(jù)乘法交換律計(jì)算.
解答:解:
1
4
=32
3
5
×3=
9
5
5
8
×4=
5
2
1
3
+
3
4
)×12=13
4
9
×
2
3
=
8
27
4
9
+
2
3
=
10
9
2
3
÷
3
2
=
4
9
3
4
+
1
4
×3=
3
2
12×
3
4
=9
12÷
3
4
=16
12+
3
4
=12
3
4
1
3
×
1
4
÷
1
3
×
1
4
=
1
16
2.44-0.1=2.34 4.2÷0.3=14 15×30%=4.5
5
6
÷
3
5
÷
5
2
=
5
9
0.52=0.25
1
5
+
1
4
=
9
20
12-
3
4
=11
1
4
40÷40%=100
點(diǎn)評:完成此類題目要細(xì)心,在保證做題質(zhì)量的同時(shí),要注意提高做題的速度.
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