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 Wysłany: Pią 15:38, 07 Sty 2011 Temat postu: mbt scarpe prezzi From an application questions ab |
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From an application questions about
': = A d + l' clear distance between vehicles should be an increasing function of d. Questions used in car speed away from the d and the product of the square and body length is proportional to (body length multiplied by _ / export operations to the following simple) is reasonable. But because the problems in the selected data \Unreasonable because the data is this: When the driver saw the vehicle behind the front of a vehicle speed change response time r (approximately o.3 seconds), then there is a braking time r: (about 2 seconds), after the brakes pet uniform deceleration of vehicles, we take r to estimate half the vehicles during this time the distance (1 +0.3) v. V take a 60 km / hour 16.5 meters / second, traffic can be estimated distance of about 21.5 meters, if the car body length l of a 5 m, 1.441 is only 7.2 m, the distance between vehicles 1.44l is unsafe. Throughout This question, feel and live with the knowledge base of students have a certain distance. If students do not have some of the fluid (water, air) 'knowledge is difficult to understand why taking one for the objective function g. From the above example shows that treatment of math word problems for middle school 2005 10 25 * Mathematical Monthly who was taught not only to consider how to solve the problem,[link widoczny dla zalogowanych], but also to focus on the application of the research question itself. Attention on the existing knowledge structure, the problem of ideological and cultural background. I think the application of the preparation of the first to follow the theme of the following two basic principles. One of the reality: The preparation of the theme of production and life must proceed from reality,[link widoczny dla zalogowanych], one of the purposes of teaching word problems should be the penetration of dialectical materialism to the students, so the situation should be involved directly or indirectly, the lives of students experience, or students with their own life experiences to achieve through the moderation of Applied Mathematics, the purpose of knowledge to solve practical problems, the application can not be divorced from students in the preparation of the theme of real life. Entrance examination in 2000 Applied Maths, for example, the price and yield of tomatoes were abstracted into a variation of a function and a quadratic function is reasonable and credible, because the price changes in the market often as arithmetic progression, and tomatoes production costs because of the factors that influence the design more quadratic function of teachers in the teaching of the usual to say that out of such relationship is not subjective, but based on practical experience. Second,[link widoczny dla zalogowanych], the principle of science: The problem of the preparation to comply with the laws of nature, can not be contradictory to the knowledge of other disciplines,[link widoczny dla zalogowanych], nor with the people's living habits, and often the actual process of the operational phase-contradiction. As an example, the solubility of salt at room temperature is about 36 grams, 100 grams of water that can dissolve up to 36 grams of salt, the salt concentration in the application of the relevant issues involved in the salt concentration should not exceed this saturated brine concentration. If the application problems of teaching problems through the application of positioning to master some mathematical knowledge, it is clearly wrong, because it difficult not only to teaching, and so that students feel math word problems on paper, divorced from reality,[link widoczny dla zalogowanych], but the mathematical application of losing the trust, which is contrary to our wishes. To stay on one question: if Wu Youhua (Hing Yan Middle School, Jiangsu Province, Tongzhou 226371) called the Idea, is related to mathematical problems to be solved, to take some means to make the problem by changing the transformation can be attributed to an already solved problem; or reduced to a relatively easy problem; or reduced to an already well known with the established method and procedures, finally get the solution of the original problem. This refresher course to third year in a variety of typical conditions of inequality proof, for example, introduce the application of the Idea, for your reference. Problem is known to real x, Y, to meet the + Y +21-1, verify: z + + ≥ ÷. ol Lenovo quadratic function, the original problem is a quadratic function of the normalized values in order to prove the problem is greater than zero 1.1 Lenovo quadratic function of the selected principal component, the original problem to determine a quadratic function of the minimum return is greater than or zero problem Solution 1 Order, (z) a z + y + a ÷, then, (z) = z + y + (1 A z-) a ÷ a 2x +2 y-2 a 2x +2 xy +1 a ÷ a 2x + (2 a 2) z +2 y a 2y + a 2 [z + c a z + (yZ-+÷)]= 2 [(tadpole + (yZ_y + material when z: L time, If (Chun Qu =, f) No. (a, curse + Ji) === No. (I) ≥ 。....,( z) ≥ If (x)] i ≥ 0, .-. f (x) ≥ 0. that z + Y + ≥ ÷.
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