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(0,2,3), (-2,1,6), (1,-1,5).若|a|=,且a分别与垂直,则向量a为( ) A.(1,1,1) B.(-1,-1,-1) C.(1,1,1)或(-1,-1,-1) (1,-1,1)或(-1,1,-1)
(a,b,c)=(1,1,1)、(-1,1,1) (a,b,c)=(1,1,1)、(-1,1,-1) (a,b,c)=(1,1,-1)、(1,1,1) (a,b,c)=(1,1,-1)、(-1,1,1)
1A,1B,1C,1D 1A,1B,1D,1C 1A,1C,1B,1D 1A,1C,1D,1B
1A,1B,1C,1D 1A,1B,1D,1C 1A,1C,1B,1D 1A,1C,1D,1B
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(-1,1,1)
3、4、7、10 3、4、7、C1+A1 3、4、=A1+B1、10 3、4、=A1+B1、C1+A1
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(1,1,1)
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(1,1,1)
1A/1B/1C/1D 1A/1B/1C/1E 1A/1B/1E/1F 1A/1B/1D/1F
=∠A1,则△ABC≌△A1B1C1; (2)若AB=A1B1,AC=A1C1,∠ =∠B1,则△ABC≌△A1B1C1; (3)若∠A.=∠A1,∠ =∠C1,则△ABC∽△A1B1C1; (4)若AC∶A1C1=CB∶C1B1,∠C.=∠C1,则△ABC∽△A1B1C1. 其中真命题的个数为( ) A.4个 B.3个 C.2个 1个
A1+B1+C1 SUM(A1,B1,C1) SUM(A1:C1) =A1+B1+C1
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(-1,1,1)
A1+B1+C1 SUM(A1,B1,C1) SUM(A1:C1) =A1+B1+C1
“=Sum(A1:C1)” “Sum(A1:C1)“ “=A1+B1+C1” “A1+B1+C1”
C1=#A#1#B#1 SC$1=A1/B1 C1=A1/%B%1 C1=$A$1/$B$1
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(-1,1,1)
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(-1,1,1)
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(1,1,1)