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(A=2,B=1,C=5),(A=2,B=1,C=4),(A=1,B=2,C=5),(A=1,B=1,C=5) (A=2,B=1,C=5),(A=2,B=1,C=4),(A=1,B=2,C=5),(A=1,B=2,C=4) (A=2,B=1,C=5),(A=2,B=1,C=4),(A=1,B=2,C=5) (A=2,B=1,C=5),(A=1,B=2,C=4)
(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
3、4、7、10 3、4、7、C1+A1 3、4、=A1+B1、10 3、4、=A1+B1、C1+A1
D4D2D1A4A2A1B4B2B1C4C2C1 A4A2A1B4B2B1C4C2C1D4D2D1 A1A2A4B1B2B4C1C2C4D1D2D4 D1D2D4A4A2A1B4B2B1C1C2C4
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)
ab c a(1-b)(1-C) a(1-b)(1-c) a(1-(1-b))(1-(1-C))
(1,1,1),(-1,1,1) (1,1,1),(-1,-1,-1) (1,1,-1),(1,1,1) (1,1,-1),(-1,1,1)
(A=2,B=1,C=5),(A=2,B=1,C=4),(A=1,B=2,C=5),(A=1,B=1,C=5) (A=2,B=1,C=5),(A=2,B=1,C=4),(A=1,B=2,C=5),(A=1,B=2,C=4) (A=2,B=1,C=5),(A=2,B=1,C=4),(A=1,B=2,C=5) (A=2,B=1,C=5),(A=1,B=2,C=4)