[ʏZ]
ac

bc

xc

ycQ[WZ

[KEZ]
cD, DF, F, a b x y

cF, D, DF, a b x y

hcB,  F, a b x y

cD, D, a b x y 󒆂łgp\

cD, DF, F, a b x y 󒆂̂ݎgp\

[KEZ]
Q[W1
cD, DF, F, a+b

QcD, DB, B, a+b

Q[W2
PcD, DF, F, x+y 20qbgȏ̎Ɏgp\

@GcD, DB, B, x+y