Összeadás 2.                                                                       ×vissza

7. feladat megoldása

(+

4)

+

(–

9)

=

+

4

–

9

=

–

5

(+

1)

–

(–

7)

=

+

1

+

7

=

+

8

(–

5)

–

(+

4)

=

–

5

–

4

=

–

9

(–

8)

+

(–

7)

=

–

8

–

7

=

–

1

5

(+

9)

–

(+

2)

=

+

9

–

2

=

+

7