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对较复杂的行程问题,多重设元、设而不求、整体求解是常用的解题策略.然而在中考中,还有这样一类题:题目中一些数量未知而列方程又需要,为此要多重设元;在求解中不需要甚至求不出每一个量,而只需要求出某几个量的整体关系,设而不求、整体求解.请看几例.例1(2011年重庆)某步行街摆放有若干盆甲、乙、丙三种造型的盆景.甲种盆景由15朵红花、24朵黄花和25朵紫花搭配而成,乙种盆景由10朵红花和12朵黄花搭配而成,丙种
For the more complicated itinerary, it is more common to solve the complicated problem by setting multiple elements instead of asking for it. However, in the middle school test, there is such a kind of question: To multiple set yuan; in the solution does not need to find every quantity, but only need to find a certain amount of the overall relationship, instead of seeking, the overall solution.Please see a few cases.Example 1 (2011 Chongqing ) A pedestrian street placed a number of basin A, B, C three kinds of modeling bonsai. A bonsai by 15 safflower, 24 yellow flowers and 25 with purple flowers, B kinds of B from 10 red flowers and 12 With yellow flowers, C species