Current location - Training Enrollment Network - Mathematics courses - Mathematics required for senior one is 4. The second chapter reviews the answers to reference questions.
Mathematics required for senior one is 4. The second chapter reviews the answers to reference questions.
Review the reference question group A: P 1 18 1. ( 1) √ (2) √ (3) × (4) × 2.( 1) D (2) B (3) D (4) C (5)。 2(a b) 4。 As shown in figure DE = BA = MA-MB =-2/3a1/3ad-2/3a2/3bc =1/3a1/3ef =-1/3a-1. 3bab = 2/3a- 1/3bce =-Ab 5。 ( 1) AB = (8,-8) │AB│=8√2 (2)OC=(2,- 16) OD=(-8,8)。 It is proved that AB=CD Because AB=( 1,-1) and CD=( 1,-1), the connection between AB and CD*** is 7. d (-2,0) 8。 n = 29。 λ.CosB=0 cosC=4/5 1 1。 It is proved that: (2n-m) * m = 2n * m-m 2 = 2cos60-1= 0, so, (2n-m) ⊥ m 10. | a-B | = 1 14 . cosθ= 5/8 cosβ= 19/Group 20 B p 1 19 1。 adbccd2。 Proof: A ⊥ B→| AB | = | A-B || AB | = √ (AB) 2 = √ (| A | 2 | B |) So | ab | = √ (| a | 2 | b | 2) = | a-b | Duplicate certificate | AB.