Question

X*Y=110 X-Y=1求详细解法. 假如110换成111呢.

Answer 1

x*y=1

=> x=1/y

110x-y=110/y-y=1

=> y^2+y-110=0

(y-10)*(y+11)=0

=> y=10 或 y=-11

x=1/10 或 x=-1/11

换成111的话

x*y=1

=> x=1/y

111x-y=111/y-y=1

=> ...