Question

Fie f: R =》 R
f(x) =3-x supra 2.
1. Calculați f(-1)+f(-2)×f(2).
2. Calculați f(1/2)×f(2/3).

Cat mai repede va rog,dau coroana!!​

Answer 1

Răspuns:

Explicație pas cu pas:

f(x) = (3 - x)/2

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

f(-2) = (3 + 2)/2 = 5/2

f(2) = (3 - 2)/2 = 1/2

2 + 5/2×1/2 = 2 + 5/4 = 8/4 + 5/4 = 13/4

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f(1/2) = (3 - 1/2)/2 = (6/2 - 1/2)/2 = (5/2)/2 = 5/4

f(2/3) = (3 - 2/3)/2 = (9/3 - 2/3)/2 = (7/3)/2 = 7/6

5/4×7/6 = 35/24