题目内容

1
6
+
5
6
=
5
9
-
4
9
=
3
5
+
1
5
=
1-
1
2
=
1
3
+
1
3
=
4
10
+
5
10
=
2
7
+
2
7
=
8
10
-
5
10
=
7
8
-
2
6
=
1-
3
7
=		 11×9= 300×4=
2000×5= 44+8= 80×5=
4000×4= 6×200= 3400×0=
分析：根据分数加减法和整数乘法与加法的计算方法进行计算．
解答：解：
1
6
+
5
6
=1
5
9
-
4
9
=
1
9
3
5
+
1
5
=
4
5
1-
1
2
=
1
2
1
3
+
1
3
=
2
3
4
10
+
5
10
=
9
10
2
7
+
2
7
=
4
7
8
10
-
5
10
=
3
10
7
8
-
2
6
=
13
24
1-
3
7
=
4
7
 11×9=99 300×4=1200
2000×5=10000 44+8=52 80×5=400
4000×4=16000 6×200=1200 3400×0=0
点评：口算时，注意运算符号和数据，然后再进一步计算．
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口算大比拼
5×0=		 510×7= 1-
3
4
=		 0+0= 297×5≈
3
3
-
2
2
=		 3000×2= 88×8=
7
9
-
5
9
=		 400×3=
26÷5=
1
6
+
5
6
=		 2×6+3= 875+25= 5+5×6=
下面各题怎样简便就怎样算．
(
8
9
+
4
27
)×27
5
7
×16×
21
5

5
6
×
5
9
+
5
9
×
1
6

5
7
+
5
6
+
2
7
+
1
6
．
3
4
×2=
1
6
+
1
2
=
5
9
÷5=
1
12
×
6
7
=
3
4
÷3=
5
4
×
5
4
=
5
8
÷1=		 5-
2
3
=
3
9
×12=
3
5
×
5
12
=		 4-
2
3
=
7
12
×3=
2
7
÷14=		 8+
3
5
=		 0×
13
30
=		 39×
3
13
=
8×
1
2
=
5
6
÷
3
4
=		 4×
12
7
=		 20÷
4
5
=
1-
9
10
=		 2.5×16=
5
12
÷
1
6
=
3
2
×
4
5
=
8
15
÷24=		 11÷
22
8
=
1
2
÷
3
8
=
4
7
÷
2
3
=
3
4
+
1
7
=		 1.5÷0.05= 0×
1
9
×9=		 1.5÷0.05=
5
8
÷
7
12
=
4
5
×
2
3
×
5
6
=
5
9
×
2
5
=		 2.5×0.4=
14×
5
16
=		 (
1
2
+
1
3
)×12=
14
33
×
3
7
=		 0×
7
9
=
5
8
×
5
8
=
5
21
+
4
7
=
7
9
÷7=		 2-
1
4
=
3
5
-
1
8
=
4
21
÷
8
7
=
2
3
-
1
4
=		 6.25+1.75=
1
2
÷
7
18
=
9
10
×6=
1
8
+
1
9
=
3
4
÷
4
3
=
1
2
×
2
3
=		 12-
5
7
=		 1÷
2
5
=
2
9
÷18=
7
28
÷
2
9
=		 10×1×
2
5
=		 20÷
4
5
=
1
3
×9+9×
2
3
=
42÷
21
23
=
3
8
÷12=
3
5
+3=
14
15
-
11
15
=
5
9
+
7
9
=
5
7
-
5
7
=
7
8
-
1
8
=
4
21
+
17
21
=
3
5
-
2
5
=		 1-
4
7
=
1
6
+
5
6
-1=		 1-
9
14
-
3
14
=
7
13
+
6
13
+1=
4
11
-
2
11
=

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