(X-> 3) xx = 2) = (= x-> o) 2x + ... + x + ...) = oo?

(X-> 3) xx = 2) = (= x-> o) 2x + ... + x + ...) = oo?
Anonim

תשובה:

# "ראה הסבר" #

הסבר:

# "הכפל" #

# (= X = 2 + x - 1) + sqrt (x ^ 2 - 7 x + 3)) / (sqrt (4 x ^ 2 + x - 1) + sqrt (x ^ 2 - 7 x + 3)) #

# "אז אתה מקבל" #

(# x2> x - 1) + sqrt (x ^ 2 - 7 x 3)) # #

# "(כי" (a-b) (a + b) = a ^ 2-b ^ 2 ") #

# (= 1/1 / (4x) - 1 / (4x ^ 2))) + sqrt (x ^ 2 (1 - 7 / x + 3 / x ^ 2)) #

מס '1 (0 + 0 - 0) + x sqrt (1 - 0 + 0) # #

# "(מכיוון ש-" lim_ {x-> oo} 1 / x = 0 ") # #

# = lim {x-> oo} (3 x ^ 2 + 8 x - 4) / (x 3) #

# = lim {x-> oo} (x + (8/3) - (4/3) / x) #

# = oo + 8/3 - 0 #

# # oo #