Title 1 2 3 4 5 6
Answer A C A D C B
Fill in the blanks (3 points for each small question, 27 points for * * *)
Title: 78910112131415.
Answer 1 6 4a5
B6395 (not unique)
90 30 53
Iii. Answering questions (***55 points)
16.(6 points) 2 points for each map, each grid 1 point, ***6 points.
(1) The following figures are for reference:
(2) The following answers are for reference: The above figures are from left to right; No; It is not a surface expansion diagram of a cube.
17.(6 points) solution: original formula = 4x2+y2+4xy-(2x2+2xy-xy-y2)-2 (x2-4y2) ....................................................................................................
= 4x 2+y2+4xy-2 x2-2xy+xy+y2-2 x2+8 y2
=10y2+3xy ................................. 5 points.
Replace the values of x and y you choose,
And correctly obtain the value of the original formula. ........................................................................................................................................................................
18.(7 points)
Guess: AE and BD are parallel. ................. 2 points.
Reason: Because ∠ 1 = 105, ∠ 1 = 3 ∠ 2,
So ∠ 2 = 35, and because ∠ C = 70, so.
So ∠ CFB =180-35-70 = 75 ...................., 5 points.
So ∞∠DFA =∠CFB = 75.
So ∠ DFA+∠ 1 = 180.
So AE ‖ BD.....................7 points.
19. (3 points for each space, * * * 9 points)
Solution: (1); (2) ; .
20.(9 points)
(1) This month, Xiao Wang's mobile phone bill * * is 6 ÷ 4% = 150 yuan; (2 points)
(2)( 1-4%-40%-36%)×360 =72 ; (3 points)
(3) The bar graph is omitted. (For each additional column, 1 minute, for each blank in the table, 1 minute, ***6 points)
Monthly function fee, basic telephone fee, long-distance telephone fee and SMS fee.
Amount/Yuan 6 60 54 30
2 1.(9 points)
Solution: (1) The length of BC in Figure A is 2×4 = 8cm；; .........................., two points.
(2) In Figure B, A =×6×8 = 24 cm2.
In Figure B, b = (2× 4+2× 2+3× 2+6-4+8+6) ÷ 2 =17 seconds; .......................... scored six points.
(3) The area of the graph in Figure A is14× 6-4× 6 = 60 cm2, and .................................... is 9 points.
22.(9 points) Solution: (1)① Because seconds,
So centimeters, .............................................................................................................................................................................
Because AB = AC = 12cm and this point is the midpoint,
So BD=6 cm ............... 3 points.
And because PC=BC-BP, BC=9 cm,
So PC=9-3=6 cm.
So ............... scored four points.
Because,
So ...
So ................ scored five points.
(2) Because the speeds of two points are not equal,
Because BP=PC=4.5 cm, CQ=BD=6 cm.
So the point and the point moving time is 4.5÷3= 1.5 seconds.
So the speed of point Q is 6 ÷1.5 = 4 cm/s ..........................
(2) Let the points meet for the first time after seconds. We get 4x = 3x+2x 12 from the meaning of the question.
The solution is x = 24, .............. 8 points.
So the point * * * moved by 24×3=72 cm.
Because 72=33×2+6, the points intersect on the side of BC.
So 24 seconds later, I first met on the edge of BC. ................... 9 agreed with 3| comments.