题目内容

直接写出得数
4.2÷42%=
5
6
×2.4=
0.77÷11=
1
2
+
1
3
=
3
5
×
1
6
=
4
7
=
1-
3
5
=
1.22=
1
10
-
1
10
×
1
10
=
1
4
+0.58+
3
4
+0.58+0.42=
分析:1.22看成1.2×1.2再计算;
1
10
-
1
10
×
1
10
先算乘法,再算减法;
1
4
+0.58+
3
4
+0.58+0.42运用加法结合律简算;其它题目根据运算法则直接求解.
解答:解:
2÷42%=
100
21
5
6
×2.4=2,
0.77÷11=0.07,
1
2
+
1
3
=
5
6
3
5
×
1
6
=
1
10
4
7
=
7
4
1-
3
5
=
2
5
1.22=1.44,
1
10
-
1
10
×
1
10
=
9
100
1
4
+0.58+
3
4
+0.58+0.42=2.58.
故答案为:
100
21
,2,0.07,
5
6
1
10
7
4
2
5
,1.44,
9
100
,2.58.
点评:本题考查了基本的计算,计算时要细心,注意多积累口算的经验,提高速度和准确率.
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