Răspuns:
Explicație pas cu pas:
2.
√(16 + √81) - √144 - (-2)^3 = √(16 + 9) - 12 - (-8) = √25 - 12 + 8 = 5 - 12 + 8 = 1
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3
-6 * (-16/9) : (-8/3) = - 6 * 16/9 * 3/8 = -4
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4.
7x/18 = 14/12
x = 18*14/7*12 = 18*2/12 = 36/12 = 3
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5
24^2 + 32^2 = 576 + 1024 = 1600
x = √1600 = 40
y = 48
z = 2*9 = 18
x - y - z = 40 - 48 - 18 = -26
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6
P = √7056 = 84 = 3*L
L = 84 : 3 = 28 cm
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7
A = 3136 = L^2
L = √3136 = 56 cm
P = 4 * L = 4 * 56 = 224 cm
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9
-11/18 + 5/12 = -22/36 + 15/36 = -7/36
(-7/36)(-24/7) = 24/36 = 2/3
2/3 + 0,75 = 2/3 + 75/100 = 2/3 + 3/4 = 8/12 + 9/12 = 17/12
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Subiectul II
1
x = 10 - 4√6
y = 10 + 4√6
media aritmetica = (x + y)/2 = (10 - 4√6 + 10 + 4√6)/2 = 20/2 = 10
media geometrica = √xy = √(10 - 4√6)(10 + 4√6) = √(100 - 96) = √4 = 2
