定义:如果一元二次方程ax2+bx+c=0(a≠0)满足a+b+c=0,那么我们称这个方程为“至和”方程;如果一元二次方程ax2+bx+c=0(a≠0)满足a﹣b+c=0那么我们称这个方程为“至美”方程,如果一个一元二次方程既是“至和”方程又是“至美”方程我们称之为“和美方程”.对于“和美方程”,下列结论正确的是( )
A:方程两根之和等于0
B:方程有一根等于0
C:方程有两个相等的实数根
D:方程两根之积等于0
用辗转相除法求8251与6105的最大公约数.
某班有学生若干人,如果男生增加15,全班人数就达到62人;如果女生减少15,全班人数就减少到51人;这个班原有学生多少人?
听独白,完成信息记录表。
How far is the school from Peter's home?
It's about kilometers.
How does Peter go to school?
He goes .
How many students are there?
There are students.
Where is the park?
It's the school.
What does Peter do in the park?
He plays with his friends.