Question

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Answer 1

Răspuns:

Explicație pas cu pas:

a = 3b/2

a)

4a + 2b = 12b/2 + 2b = 6b + 2b = 8b

3a + b = 9b/2 + 2b/2 = 11b/2

8b : 11b/2 = 8b * 2/11b = 16/11

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b)

a^2 + 2b^2 = 9b^2/4 + 8b^2/4 = 17b^2/4

2a^2 + b^2 = 2*9b^2/4 + 4b^2/4 = 22b^2/4

17b^2/4 : 22b^2/4 = 17b^2/4 *4/22b^2 = 17/22

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c)

a^2 - b^2 = 9b^2/4 - 4b^2/4 = 5b^2/4

6ab = 6*3b/2*b = 18b^2/2 = 9b^2

5b^2/4 : 9b^2 = 5b^2/4 * 1/9b^2 = 5/36