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：根據(jù)分?jǐn)?shù)加減法和整數(shù)乘法與加法的計算方法進(jìn)行計算．
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
點評：口算時，注意運算符號和數(shù)據(jù)，然后再進(jìn)一步計算．
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