100X-51Y＝49；51X-100Y＝-49
连立2个式子:
100X-51Y+51X-100Y=0
151x-151y=0
x=y
100x-51x=49
x=1
y=1 100X-51Y＝49；51X-100Y＝-49
连立2个式子:
100X-51Y+51X-100Y=0
151x-151y=0
x=y
100x-51x=49
x=1
y=1