题目内容

1-
4
5
中的“1”可以看成（　　）
A．2个
1
5
B．5个
1
2
C．2个
1
2
D．5个
1
5
1-
4
5

=
5
5
-
4
5

=
1
5

所以1可以看成5个
1
5
，
故选：D．
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相关题目
口算．
0.24+6.9=9.1-7.3=1.2×6=7.2+2.8=
31×3=24×5=1000÷8=0.8×0.6=
1.25×4=300÷50=480÷0.6=0.15×9=
3.4×0.7=2.2×3=0.2×1.1=2.1÷0.3=
2
5
+
1
5
=
5
8
-
3
8
=
5
9
+
4
9
=		1-
1
4
=
直接写出得数．
210÷7=1.7+3=10-0.46=25×0.4=
2
3
×
3
4
=		10÷
2
5
=
1
7
-
1
8
=
2
3
+
1
9
=
计算．
1-
2
3
=
3
7
+
2
7
=
7
7
-
4
7
=
2
5
+
3
5
=
9
10
-
3
10
=
3
4
-
1
4
=		1-
3
4
=
2
8
+
4
8
=
5
8
-
2
8
=______
______个
1
8
减______个
1
8
，剩______个
1
8
，就是
()
()
．
口算
1
3
+
1
4
=		10÷
2
5
=
3
5
÷
9
10
=		1÷
7
8
=
2
3
×
3
10
=
3
4
×
2
5
×
4
3
=		5×
1
10
+
1
2
=		8×
3
8
+8×
1
8
=
55×
1
11
÷
1
8
=
1
2
×
1
3
÷
1
2
×
1
3
=		0×
7
12
+
1
8
=
4
5
-
1
10
×4=
2
1
4
×2=		0.99×9+0.99=
9
4
×
1
27
=		1
1
2
×8+1
1
2
×2=
直接写出得数．
1
4
+
3
4
=
5
6
-
1
6
=
2
5
+
9
10
=
3
20
-
1
50
=
10-
4
7
-
3
7
=
2
3
-
2
3
=		 3+
1
15
=		 1
1
6
+
1
3
=
5
7
+
11
12
+
2
7
．
1÷
1
4
=
1
5
-
1
6
=		 100×
6
25
=
5
9
×27=		 5÷
1
3
=
4
7
×
5
14
=
4
15
÷12=
5
28
×4=
3
8
÷
12
17
=
一条长
5
10
米的绳子和一条长
3
10
米的绳子合起来长多少米？

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