已知函数f(x)=x2+2x+a,f(bx)=9x-6x+2,其中x∈R,a,b为常数,则方程f(ax+b)=0的解集为
。
由题意知,所以
,所以解集为。
Read and write. (用所给单词的适当形式填空)
1. It's _____ for little children to play by the river by themselves. (danger)
2. — Who is _____, Tom or John? (clever)
— Oh, it's hard to say.
3. The Space Museum is a very _____ place. (interest)
4. Guangzhou is in the _____ of China. (southern)
5. There are some new _____ on the desk. (photo)
为合理传递荷载,现浇混凝土模板支撑系统立柱底部应设置()垫板。
A.木
B.钢
C.砖
D.大理石