X = 7, y = -2 일 때 (3 + 2x-y) / (x + 2y)를 어떻게 평가합니까?

대답:

#7#

설명:

# (3 + 2abs (7 - (- 2))) / (7 + 2 (-2)) #

# (3 + 2abs (7 + 2)) / (7-4) #

# (3 + 2abs (9)) / (7-4) #

#(3+2(9))/3#

#(3+18)/3#

#21/3#

#7#

대답:

7

설명:

값# = (3 + 2abs (x-y)) / (x + 2y) # …에서 # x = 7, y = -2 #

# = (3 + 2xxabs (7 - (- 2)) / (7 + 2xx (-2)) #

# = (3 + 2xxabs (9)) / (7-4) #

# = (3 + 2xx9) / 3 #

#= (3+18)/3 = 21/3 =7#