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=SUM(A1:C1) =TOTAL(A1:C1) =AVERAGE(A1:C1) =COUNT(A1:C1)
y=x+7 y=x+8 y=1.4x+0.5 y=x+4
B两点所表示的有理数分别是x.y,且|x|=2,|y|=3,则A.B两点间的距离是( )
A.5 1 5或1 以上都不对
y=-1+x y=1+x y=1.5+0.7x y=1+2x
(1,3), (2,3、8), (3,5、2), (4,6),则y与x之间的回归直线方程是 A.B.C.D.
=SUM(A1:C1) =TOTAL(A1:C1) =AVERAGE(A1:C1) =COUNT(A1:C1)
Y=X/(1+i)-i Y=X/(1+i) Y=x(1+i)-i Y=X(1+i)
0,0,1/2,1/2 1/2,1/2,0,0 0,0,1/2,0 1/2,0,0,0
=SUM(A1: C1) =TOTAL(A1:C1) =AVERAGE(A1: G1) =COUNT(A1: C1)
(1,2), (2,3), (3,4), (4,5),则y与x的回归方程为( ) (A.) B. C. D.