Question

Completeaza cu numerele corespunzatoare □:9=70:10 □:10=54:9 □:9=56:7 □:10=45:9 90:□=63:7 90:□=80:8 10:□=9:9 10:□=10×1.

Answer 1

➣ Rezolvare:

• Notez □ cu litera " a ".

a : 9 = 70 : 10

a : 9 = 7

a = 7 × 9

a = 63

______________

a : 10 = 54 : 9

a : 10 = 6

a = 6 × 10

a = 60

______________

a : 9 = 56 : 7

a : 9 = 8

a = 8 × 9

a = 72

______________

a : 10 = 45 : 9

a : 10 = 5

a = 5 × 10

a = 50

______________

90 : a = 63 : 7

90 : a = 9

a = 90 : 9

a = 10

______________

90 : a = 80 : 8

90 : a = 10

a = 90 : 10

a = 9

______________

10 : a = 9 : 9

10 : a = 1

a = 10 : 1

a = 10

_____________

10 : a = 10 × 1

10 : a = 10

a = 10 : 10

a = 1

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