I. 1B，2B，3C，4D，5D，6C
Second, seven. AB(3)C(0)D(5)E(-2)； 8. Omission;
9. Four, three, two, one, X axis, Y axis;
10. (0,0), vertical and horizontal.
1 1.A(3，3)，B(7，2)，③(3， 1)，D( 12，5)，E( 12，9)，
F(8， 1 1)，G(5， 1 1)，H(4，8)，I(8，7)；
12. Omit;
13.(5,-5)(-5,-5),(2,8),(-2,2);
14. Vertical common * * * origin horizontal axis, X axis, right, vertical, Y, up, origin;
Three. 15.A (0，6)，B (-4，2)，C (-2，2)
D(-2，-6)E(2，-6)F(2，2)G(4，2)
16. Omit
17. Sketch A 1(0 (0,1) B1(-3,5) C1(5,0).
18. These points are on the same straight line, for example, on the bisector of the corner of quadrant 24.
19. Analysis:
(1) On the X-axis, the nearest place to Village A is the vertical foot passing through A as the vertical line of the X-axis, that is, point (2,0);
(2) The point (7,0) is the closest to Village B;
(3) Find the symmetrical point (2, -2) of A about the X axis, which is connected with B. It is easy to see that the connected straight line intersects with the X axis at point (4, 0), so it is the shortest from the sum of the two villages here.
20. Analysis:
( 1)(2,3),(6,5),( 10,3),(3,3),(9,3),(3,0),(9,0);
(2) The translated coordinates are (2,0), (6,2), (10,0), (3,0), (9,0), (3,3), (9,3).
2 1. Analysis:
(1) Establish a plane rectangular coordinate system with point A as the origin and X axis as the horizontal direction.
So the coordinates of c, d, e and f are C (2 2,2), D (3 3,3), E (4 4,4) and F (5 5,5) respectively.
(2) Compare the coordinates of B, C, D, E and F with the coordinates of point A, and add 1, 2, 3, 4 and 5 on the abscissa and ordinate respectively.
(3) The height and width of each step are 1, so the height and length of step 10 are 10 and1respectively.
2.202 1 seventh grade math summer homework answers
( 1)
1. Balloon drops 6 meters 2.0,03. -3,3,34.5,-4,05.>，& lt,=6.0
7.368. Omit 9.b10.b1.c12.b13. Positive integer: 10,+68; Negative integer:-20; Positive score: 0.22, +9.78, 0.3,+; Negative score: -2.5,; Positive rational numbers: 10, 0.22, +9.78, +68, 0.3,+; Negative rational numbers: -2.5, -20 14. The number axis is abbreviated as -3.
15. (1) 4,6,4 (2) is abbreviated as 16.2009.
(2)
1.( 1)-6(2)-42.-9+2-7-5+43.54.- 105.A6.D7.A
8.( 1)-30 (2)-3.5 (3) 19 (4)-29.2, 14 10.( 1) 9 (2)-498.
(3)
1.(1)18 (2) 28 (3)-72 (4) 02. 3.04.D5.D6.C is omitted.
7.( 1)2(2)2(3)6(4)08. Omit 9. ( 1)
(4)
1.-2, 2, 42.2, 2,-43.04.1 thousand, 35. D6
9. (1) 809.79 (2) 0.083 (3) 54.8 million (4)9.7× 107
3.202 1 seventh grade math summer homework answers
1. B3 B2 1, (1) > (2) <; (3)2(2)a+b≥0
Second, 1, x≥32, x >；; 1.53, x <-8/34, 2x6 axis is abbreviated as (2) x >; Brief representation of -2 number axis
8 、( 1)x & gt； The number axis of 2 represents the abbreviation (2) x >; The -2.5 number axis means slightly 9,2 ≤ x3/11.
Three. Operational query (1) when x=2, y= 15, when x=-2, y = 3 (2)-17/8 ≤ X.
Four. 1，x≤2802， 137/ 18 & gt； X> 137/ 193 and 4.5km (1) c > A & gtb(2)R & gt； S>P>q innovation stage
When m>n, don't promise; When m=n, it doesn't matter; When m
Verb (abbreviation of verb) 1, B2, D3, (1) a+ab (2) x+y (3)1(4) ac4, (1) 36a4ba (note: 4 4 is 4.
5.( 1)5x- 10y/2x-40(2)x-20/ 130 x+246，( 1) 1/3x = 4y/ 12xy。
6. 1,-12,33, x4-6DAC7, (1) 2/xz (2)10/3a (a+2) operation.
Seven. If 1, (1)x=0(3)x=0 (question 2-) 2,1/73,344, (1)③(2) is incorrect, the denominator (3)-2x should be kept.
Eight, 1, m & gt-62, 5 yuan perception experience.
9. 1, y=50/x2, omitting 3, > 2/34, m> 1/25, D6, B7, (1) y =-18/x (2) x =
X. 1-3AAD4，( 1)s = 100000/d(2)200m(3)6666.67m。
11. 1, 242, C3 10m and 6m innovation booths (1) for 30min (2) are invalid.
Twelve. 1, C2, D3, (1)1:100000 (2)1:100000 (3) Unit conversion 4, (1) AB5, (1)5/2(2)5/26, (1)8(2) omitted (hint: DB/AB=2/5, EC/AC=2/5DB/AB=EC/AC) innovation stage 0.5cm (.
Thirteen, the basic display (1) blind area (2) is not allowed. Blind area (3) within the range of 3)AB (4) Brief understanding of the operation of 7.6m
Fourteen,1-3ccd4,2:11:25, 126, 17, (1) 135 radicals 8(2) are similar.
Fifteen. 1-3CBC4 innovation stage, ∠ ACP = ∠ ABC 5,2/56, (1) DE = AD, BE = AE = CE (2) △ ade ∽△ AEC (3) 2.
XVI. 1, A2, D3, Figure 1 optical center projection; Fig. 2 Operation of sunlight parallel projection 6.40m (1)1.25 (2)1.5625 (3) y = d/4 (4) 0.4m.
Seventeen, all drawing reasoning questions, omitted.
Eighteen. 1, (1)√(2)×(3)√2, B3, A4 and a brief operation query (1) hint: PQ parallel AC(2) is invalid (3) √ PAC = √ APB +∞.
XIX. 1, C2, C3, =4, unreasonable 5, no 6, (1) Correct operation (2) Exploring (1) 180 (2) The external angle of an equilateral triangle is equal to two non-adjacent internal angles and the sum of the three internal angles of the triangle is
Twenty, 1, C2, CD3, ellipsis (hint: connecting AD) operations to explore the reasons for parallelism and slightly innovate the stage (such as: known (1), (2), (4), verification (3)).
Twenty-one, 1, B2, C3, different 4, unequal probability of not winning 5, (1) touching any number is equal, (2) unequal, (3) unequal operation query falls in red, green or yellow area.
Twenty-two, 1, (1) equal (2) unequal extraction Wang (3) equal operation inquiry-incorrect red ball p (red) =2/3, p (white) = 1/3, ∫p (red) > p. Question 2: Take out a red ball perception experience. ① slightly ② when a >; There is as much milk in the milk cup as in the milk cup.
Twenty-three, 1, A2, 5/83, 6/254, (1)/4 (2) Omit (I feel the suggestion is not clear, I wrote 2/5)5, 7/8 1/8 operation exploration (.