Question

Heeeelpppp!!!!!

ex1) -7+2(-8+5)

ex2) x-1/2 + x+1/4

ex3) 1/2 + 1/64 + 1/48

ex4) x - 7x ≤ 8x + 5

ex5) (x-2)↑2 + (x+2)↑2

ex6) 2↑-3 + 2↑-2 + 2↑-1
,,/,, = ,,supra,,
,,↑,,= ,,la puterea,,

Answer 1

Răspuns:

Explicație pas cu pas:

-7+2(-8+5) = -7 + 2*(-3) = -7 - 6 = -13

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x-1/2 + x+1/4 = 2x - 2/4 + 1/4 = 2x - 1/4

daca fractiile erau (x-1)/2 si (x+1)/4:

(x-1)/2 + (x+1)/4 = (2x - 2 + x + 1)/4 = (3x - 1)/4

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1/2 + 1/64 + 1/48 = 96/192 + 3/192 + 4/192 = 103/192

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x - 7x ≤ 8x + 5

x - 7x - 8x ≤ 5

-14x ≤ 5

x ≤ - 5/14

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(x - 2)^2 + (x + 2)^2 = x^2 - 4x + 4 + x^2 + 4x + 4 = 2x^2 + 8

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1/8 + 1/4 + 1/2 = 1/8 + 2/8 + 4/8 = 7/8