A:was worth to be bought
B:was worth buying
C:being worth buying
D:be worth buying
下列关于单项式-3x2y5的说法中,正确的是( )
下列原子模型最接近事实的是( )
x
x1
x2
x3
x4
5
y
2.5
4.6
5.4
n
7.5
若x1+x2+x3+x4=10,计算得回归方程为 y∧ =2.5x﹣2.3,则n的值为( )