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青龙一小 张艳 PowerPoint PPT Presentation


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加法运算定律. 青龙一小 张艳. 加法运算律:. 加法运算律:. 今天上午骑了 40 千米,下午骑了 56 千米。一共是多少?. 上午: 40 千米. 下午: 56 千米. 加法运算律:. 加法运算律:. 1 、李叔叔上午骑了 40 千米,下午骑了 56 千米。今天一共骑了多少千米?. 上午: 40 千米. 下午: 56 千米. 一共多少千米?. 一共多少千米?. 40+56. = 96 (千米). 56+40. = 96 (千米). 2 .观察等式, 发现特点:. =. 40 + 56 56 + 40.

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青龙一小 张艳

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6434377


6434377

4056


6434377

40

56

14056

40

56

40+56

=96

56+40

=96

2

=

40+5656+40

4056


6434377

=

+

+

+=

+

a+b=

b+a


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  • 96+35=35+ 300+600= +

  • 35+ =65+ 76+ = +76

96

600

300

65

35

a

a


6434377

88

104

96


6434377

88

96

104

1

2

88+104+96

88+104+96

88+104+96

=

=192+96

=88+200

=288

=288


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=

13+45+2513+45+25

=58+25

=13+70

36+18+2236+18+22

=83

=

=83

=54+22

=36+40

69+172+2869+172+28

155+145+207 155+145+207

=76

=76

=

=


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+ + = + +

a b c

a+b +c= ++


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1

876 150

+150 +876

( )

7+9=6+(1+9)

( )


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  • 2

  • (45+36)+64=45+(36+)

  • (72+20)+=72+(20+8)

  • 560+(140+70)=(560+)+

64

8

140

70


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4

1(45+188)+12 45+(188+12)

2(48+25)+75 48+(75+25)


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