因式分解后：x^2-4y^2+x+3y-1=(x+2y)(x-2y)+(x+2y)+(y-1)=(x+2y)(x-2y-1)+(y-1)=0.(1)2x-y-1=0 → y=2x-1 .(2)将（2）代入（1）得：-3(5x-2)(x-1) + 2(x-1)=0(x-1)(8-15x)=0x=1或x=8/15代回：y=1 或 y=1/15...