因式分(x2+x)2-8(x2+x)+12.
(x2+x)2-8(x2+x)+12,
=(x2+x-2)(x2+x-6),
=(x-1)(x+2)(x-2)(x+3).
-I'm afraid that I can't finish the task as soon as planned.
-________.[ ]
A.Don't be afraid
B.Don't mention it
C.I suppose so
D.Take your time
小区里有两家液化气站,甲站对会员(一直在此站换液化气的顾客)进行长年九五折优惠。乙站前四次价格不变,四次后再对会员打九折。假如你们家邻居一年用液化气10罐,询问你到哪一家换气比较划算,请你说说自己的看法。