题目内容

直接写得数．
4
9
+
5
9
=
1
8
÷
4
7
=		 5-0.5= 99%+0.1%= 8÷
1
8
=
7
12
×18=		 0.03+0.97= 0.2×10= 4÷
1
4
×4=
1
6
+
1
3
=
分析：①通过分母分数相加，只把分子相加，分母不变；②⑤⑨把除法改为乘法计算；③⑦小数点对齐；④把百分数化为小数计算；⑥约分计算；⑧先算2×10=20，然后从后向前数出一位，点上小数点；⑩通分计算．
解答：解：
4
9
+
5
9
=1
1
8
÷
4
7
=
7
32
 5-0.5=4.5 99%+0.1%=0.991 8÷
1
8
=64
7
12
×18=
21
2
 0.03+0.97=1 0.2×10=2 4÷
1
4
×4=64
1
6
+
1
3
=
1
2
点评：此题考查了约分、通分以及小数点对齐等知识．
练习册系列答案
相关题目
直接写得数．
1.5×4=		 0.12×3= 0.49÷0.7= 6.4×0.2=
3.6×0.2= 42÷0.6= 72.8÷0.8= 1.5÷30=
3×0.2×0.5=
直接写得数．
4
9
+
2
9
=
3
8
+
3
8
=
8
11
-
5
11
=
3
10
+
2
5
=		 1-
4
9
+
5
9
=
1-
5
12
=
9
13
-
4
13
=		 1-
3
8
-
1
8
=		 4-
4
5
-
1
5
=		 5-
3
7
-
4
7
=
直接写得数：
4
9
+
1
9
=		 1-
1
3
=
5
8
+
3
8
=
4
5
-
3
5
=
289×6≈ 503×8≈ 200×8= 40×5=
直接写得数．
4
9
÷12=		 3.6×5%= 12÷21= 35×
3
9
=
25÷
1
5
=		 20×
2
5
=
5
6
×
5
6
=
7
18
×
9
14
=
直接写得数．
4
9
×3=		 5÷
1
3
=
1
2
÷
1
3
=
1
3
×2=		 100×29%= 0.625×0.4=
3
8
÷
3
4
=
1
2
+
1
3
=
2
7
×（
1
4
+
1
3
）=
2
7
×
3
9
÷
2
7
=

违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com

精英家教网