Question

7;8;9. Va rog, repede! Imi trebuie acum!! Urgent!! ​

Answer 1

Răspuns:

7) 2·9=18

3·6=18

1·18=18

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2·6=12

3·4=12

1·12=12

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4·5=20

1·20=20

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6·4=24

8·3=24

1·24=24

2·12=24

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6·6=36

4·9=36

1·36=36

2·13=36

3·12=36

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8) 9·7+(9+7)=63+16=79

9·7+(9-7)=63+2=65

9·7+9·7=63+63=126

________

9) a·7=63

a=63:7=>a=9

9·7=63

5·a=30=>a=30:5=>a=6

5·6=30

Answer 2

7)

18 = 1x18 = 2x9 = 3x6

12 = 1x12 = 2x6 = 3x4

20 = 1x20 = 2x10 = 4x5

24 = 1x24 = 2x12 = 3x8 = 4x6

36 = 1x36 = 2x18 = 3x12 = 4x9 = 6x6

8)

9x7 + 9 + 7 = 63 + 16 = 79

9x7 + 9 - 7 = 63 + 2 = 65

9x7 + 9x7 = 63 + 63 = 126

9)

a) a7 = 63 => a = 63 : 7 = 9

9x7 = 63

b) 5a = 30 => a = 30 : 5 = 6

5x6 = 30