ab-2a-2=0 2ab-2b-4a+2=0 求a

问题描述:

ab-2a-2=0 2ab-2b-4a+2=0 求a

ab-2a-2=0 ①
2ab-2b-4a+2=0②
②/2
ab-b-2a+1=0 ③
③-①
-b+3=0
b=3
3a-2a-2=0
a=2