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
