加减混合运算
1、速 算:
8
3
7
3 + 5 =
5-2 =
10-3 =
8-5 =
3
8
3
9
3 + 2 +3 =
10-5-2 =
3 + 2 +4 =
7-2-3 =
2
2+4=6
4+2=6
6-4=2
6-2=4
△
你能提出什么问题?
现在还有几只天鹅?
4 + 3-2 =
5
你是怎么算出的?
4 + 3-2 =
7
5
5
从左往右计算
与连加、连减一样!
2
5
5
4- 2 + 3 =
6
=
5
4
+
3
-
△
9 – 5 + = 9
8 – + 3= 7
2 + 4 – = 5
8 – 4 + = 6
3 + – 3 = 5
2 + 5 + = 9
1
4
5
2
2
5
△
5
9-4= 6+3= 8-6= 5+3= 6-3= 10-6= 3+7= 7+3= 8-7= 10-3= 3+5= 8-5=
8-6= 7-4= 8-2= 7-5=
6+4= 2+7= 0+8= 3+5= 7+2= 5-2= 8-8= 6+4=
2
1
2
10
9
9
4
7
3
9
3
2
10
8
6
8
0
8
10
3
2
8
10
△
10
1
7
7
4 + 6 - 3=
8 - 5 + 4=
9 - 3 + 4=
2 + 7 - 8=
△
5
6
5
7
7- 4 + 2=
6 - 1 + 2=
3+ 4 - 1=
6 + 3 -4=
谢谢 再见!