Question

Subiectul 1 ofer coroana si puncte in plus

Answer 1

Răspuns:

Explicație pas cu pas:

1.

[(1/3)^25]^4 = (1/3)^100

0,(3) = 3/9 = 1/3

(1/3)^100 : (1/3)^99 = 1/3

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2.

3(3x - 2y) = 2(4x + y)

9x - 6y = 8x + 2y

9x - 8x = 6y + 2y

x = 8y

x/y = 8

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3.

160*75/100 = 120 lei

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4.

L^2 + L^2 = D^2

2L^2 = D^2

L^2 = D^2/2

A = L^2 = D^2/2 = 324/2 = 162 cm^2

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5.

3x + 5 = 7

3x = 7 - 5 = 2

x = 2/3

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6.

I^2 = (5)^2 + (5√3)^2 = 25 + 75 = 100

I = √100 = 10 cm