Juvenile Intellectual Development Newspaper 2011 2012 Answers

I have a full term, I have what you want, but it is paid, 10qb full term, I.

1.Substituting the coordinates of the point A into the analytic formula can find k=-4, the area of the triangle ADC is half of the area of the quadrilateral ABOC, and the area of the triangle PDC is half of the area of the quadrilateral PEOD, both of which are 2, parallel, because the area of the Luleak triangle APD and the triangle PDE are equal and belong to the triangle of the same base and height, so they are parallel.

3.The diamond diagonal is bisected perpendicularly, so the perpendicular bisector of ac is obtained by the abscissa -2 of the point p, and the ordinate 2 is obtained by substituting the analytic formula, so p(-2,2).

The isosceles trapezoidal diagonal is equal to ac=pd=4, so the ordinate of point p is 4, and the abscissa is -1, p (-1, 4).

The isosceles trapezoidal waist is equal, ac, pd is the waist, ac=pd=4 so the ordinate of the p point is -4, and the abscissa is 1, p(1, -4).

Not booked = 580 (1-85%) = 87.

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Solution: There are x number of students at the grade throughout the year. Then there is (4 7x+3 5x)-x=6 solution:

Because the total price of subscribing to the newspaper = unit price (certain), that is, the quotient of the total price and the number of copies of the newspaper subscribed is certain, which is in line with the meaning of proportionality, so the number of copies subscribed to the "Juvenile Intellectual Development Newspaper" is directly proportional to the number of money

So the answer is:

I, II, 10 -5 ，2，4 - 313.（n - 1），（n + 6） 14.（a - b + 3） 15.Five, three + 20), 3 (a - 20).

III. 17(1) The coefficient is 12 and the number is 3;(2) The coefficient is -4, and the number is 4;(3) The coefficient is - 32, and the number is a - 1 = 0, b + 3 = 0, so a = 1, b = 3Therefore, a - b = 1 -(3) =1 + 3 = the total amount of these two school bags sold is (38a + 26b) yuan.

When a = 12 and b = 10, the total amount is 38 12 + 26 10 = 716 (yuan).

IV. 20（1）200 × 3 + 200 × 70% x = 600 + 140x.Therefore, you need to pay a total of (600 + 140x) yuan.

2）200 × 80% ×3 + x） =480 + 160x.Therefore, you need to pay a total of (480 + 160x) yuan. 21.

1) (ab - r2) square meters; (2) When a = 300, b = 200, r = 10, ab - r2 = 300 200 - 102 = 60 000 - 100So, the area of the open space in the square is (60 000 - 100 ).

It should probably be that.

580x (1-85%) = 87 (people).

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The total number of students minus the number of subscribed students is the number of people who did not subscribe.