北师大版小学数学五年级下册 分数混合运算.doc

2007527

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9

5

×

5

3

×

2

9

9

5

×

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3

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7

6

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4

÷

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3

7

5

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1

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÷

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1

x+

4

3

=6x

7

5

=

2

1

6

5

x=

3

1

9

5

x=50x

3

1

=

6

5

4

3

x=

10

9

()

4+

10

7

x=102

6

5

x

4

1

=

3

1

8

7

2

1

x=

4

1

2

3

x

10

7

=

4

5

1

7

1

x=12

3

2

x+

2

1

x=42

x

3

1

x=

6

5

1

12

1

2200

4

1

3

4

1

50

4

65

5

1

5

15

5

1

6

4

1

12

7

5

1

75

2

120

5

3

3

2

5

3

=

3

2

=

1

120

5

3

3

2

24500

9

4

11

45004500

9

4

45001

9

4

1

9

4

3

7

5

700

11

x

x

7

5

x=700=

7

5

01

7

5

7001

7

5

4120

4

1

4

1

4

1

，11

120+120

4

1

1201+

4

1

1+

4

1

1260

15

2

15

2

15

2

1

1

12601260

15

2

12601

15

2

1

15

2

480

4

1

4

1

4

1

11

x

X+

4

1

x=480

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4

1

=480

1+

4

1

4801+

4

1

12

7

1

7

1

7

1

11

x

x

7

1

x=12

=

x1

7

1

=12

1

7

1

121

7

1

20

4

1

20

4

1

20

5

1

20

5

1

1

960

6

1

960+960

6

1

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1

5

4

1

2

6

5

1

3

4

1

3

2

36

4

6

1

1

5

5

1

1

6

10

1

10