立定跳远成绩(米)
1.2~1.3
1.4~1.6
1.7~1.8
人数(人)
4
18
占全班人数的百分比
36%
56%
下列关于染色体、DNA和基因的叙述中,正确的是( )
— Sorry, I didn't pass the exam, and then what should I do?
—I think perhaps you should be careful next time.
把代数式3x3﹣12x2+12x分解因式,结果正确的是( )