一家銀行的信貸部計(jì)劃年初投入25【精品-】

1、一家銀行的信貸部方案年初投入25 000 000元用于企業(yè)投資和個(gè)人貸款，希望這筆資金至少可帶來(lái)30 000元的收益，其中從企業(yè)貸款中獲益12，從個(gè)人貸款中獲益10，那么，信貸部應(yīng)該如何分配資金呢？那么：分配資金應(yīng)該滿(mǎn)足的條件為復(fù)習(xí)：怎么樣表示現(xiàn)實(shí)生活中存在的一些不等關(guān)系？二元一次不等式組創(chuàng)設(shè)情境分析假設(shè)信貸部用于企業(yè)投資的資金為x元，用于個(gè)人貸款為y元.回憶：初中一元一次不等式組的解集如何表示?思考：在直角坐標(biāo)系內(nèi)，二元一次不等式組的解集又如何表示呢?例如:溫故知新探討：在平面內(nèi)畫(huà)一條 直線(xiàn)，這條直線(xiàn)將平面分為幾個(gè)局部？這幾個(gè)局部可以用怎樣的式子來(lái)表示？在平面直角坐標(biāo)系中，所有的點(diǎn)被直線(xiàn) 分

2、成三類(lèi)：在直線(xiàn) 上；在直線(xiàn) 的左下方的平面區(qū)域內(nèi)；在直線(xiàn) 的右上方的平面區(qū)域內(nèi)。新知探究-66對(duì)于平面上坐標(biāo)為(3,-3)0,0,(-2,3),(7,0),(1,-6)的點(diǎn)討論它們分別在直線(xiàn)的什么方位,它們的值分別為什么?(7,0)(3,-3)(-2,3)(1,-6)0,0新知探究xy 1二元一次不等式Ax+By+C0(A,B不全 為0)在平面直角坐標(biāo)系中表示直線(xiàn)Ax+By+C=0某一側(cè)所有點(diǎn)組成的平面區(qū)域。 2由于對(duì)直線(xiàn)同一側(cè)的所有點(diǎn)(x,y)，把它代入Ax+By+C，所得實(shí)數(shù)的符號(hào)都相同，所以只需在此直線(xiàn)的某一側(cè)取一個(gè)特殊點(diǎn)(x0,y0) ，從Ax0+By0+C的正負(fù)可以判斷出Ax+By+

3、C0表示哪一側(cè)的區(qū)域。注意：新知探究小訣竅yxAx+By+C=0如果C0,可取(0,0);如果C0,可取(1,0)或(0,1).判斷方法：直線(xiàn)定界,特殊點(diǎn)定域歸納提升：O新知探究例4、畫(huà)出不等式 2x+y-60 表示的平面區(qū)域。xyo362x+y-602x+y-6=0平面區(qū)域的確定常采用“直線(xiàn)定界，特殊點(diǎn)定域”的方法。解:將直線(xiàn)2x+y-6=0畫(huà)成虛線(xiàn)將(0,0)代入2x+y-6得0+0-6=-60原點(diǎn)所在一側(cè)為2x+y-60在平面直角坐標(biāo)系中表示直線(xiàn)Ax+By+C=0某一側(cè)所有點(diǎn)組成的平面區(qū)域。 確定步驟： 直線(xiàn)定界，特殊點(diǎn)定域； 假設(shè)C0，那么直線(xiàn)定界，原點(diǎn)定域；小結(jié) 二元一次不等式Ax+

4、By+C0在平面直角坐標(biāo)系中表示直線(xiàn)Ax+By+C=0某一側(cè)所有點(diǎn)組成的平面區(qū)域。 確定步驟： 直線(xiàn)定界，系數(shù)定域； 課堂小結(jié)，根據(jù)所給圖形，把圖中的平面區(qū)域用不等式表示出來(lái)：x-y+10探索提高yox4-2x-y=0y+2=0 x+2y-4=02例6、用不等式組表示由三直線(xiàn)x-y=0;x+2y-4=0及y+2=0所圍成的平面區(qū)域。探索提高xy0 x-y=0 x+y=0 x+y=0 xy0 x-y=0 xy0 x-y=0 x+y=00 xyx-y=0 x+y=0(A)(B)(C)(D)(A)探索提高 二元一次不等式表示平面區(qū)域 二元一次不等式表示哪個(gè)平面 區(qū)域的判定方法(系數(shù)法、特值法 二元一

5、次不等式組表示平面區(qū)域(每 個(gè)二元一次不等式表示區(qū)域的公共局部) 數(shù)學(xué)思想：數(shù)形結(jié)合、化歸、分類(lèi)討論小結(jié)課后思考T2lDW5oH#9sK%cvO)gzS0jCV4nGZ8qJ$buN(fxQ+iBU3mFX6pI!atM&dwP-hAT2kDW5oH#9rK%cvO)gzR0jCV4nGY7qJ$buN(exQ+iBU3mEX6pI!atL&dwP-hAT1kDW5oH#8rK%cvO)gyR0jCV4nFY7qJ$buN*exQ+iBU2lEX6pI!asL&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4mFY7qJ$buM*exQ+iBT2lEX6pI!9sL&dwP-gz

6、S1kDW5oGZ8rK%cvO(fyR0jCV3mFY7qJ$btM*exQ+iAT2lEX6pI#9sL&dwP)gzS1kDW5nGZ8rK%cuN(fyR0jCU3mFY7qJ!atM*exQ+hAT2lEX6pH#9sL&dwO)gzS1kDW4nGZ8rK%buN(fyR0jBU3mFY7qI!atM*exQ-hAT2lEX5oH#9sL&dvO)gzS1kDV4nGZ8rK$buN(fyR0iBU3mFY7pI!atM*exP-hAT2lEW5oH#9sL&cvO)gzS1jCV4nGZ8rJ$buN(fyR+iBU3mFY6pI!atM*ewP-hAT2lDW5oH#9sL%c

7、vO)gzS0jCV4nGZ8qJ$buN(fxQ+iBU3mFX6pI!atM*dwP-hAT2kDW5oH#9sK%cvO)gzR0jCV4nGZ7qJ$buN(exQ+iBU3mEX6pI!atL&dwP-hAT1kDW5oH#8rK%cvO)gyR0jCV4nGY7qJ$buN*exQ+iBU3lEX6pI!asL&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4mFY7qJ$buM*exQ+iBU2lEX6pI!9sL&dwP-hzS1kDW5oGZ8rK%cvO(fyR0jCV3mFY7qJ$btM*exQ+iAT2lEX6pI#9sL&dwP-gzS1kDW5nGZ

8、8rK%cvN(fyR0jCU3mFY7qJ$atM*exQ+hAT2lEX6pH#9sL&dwO)gzS1kDW4nGZ8rK%cuN(fyR0jBU3mFY7qJ!atM*exQ-hAT2lEX6oH#9sL&dvO)gzS1kDV4nGZ8rK$buN(fyR0iBU3mFY7qI!atM*exP-hAT2lEX5oK%cvO)gzR0jCV4nGZ7qJ$buN(exQ+iBU3mEX6pI!atL&dwP-hAT1kDW5oH#8rK%cvO)gyR0jCV4nFY7qJ$buN*exQ+iBU3lEX6pI!asL&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4mF

9、Y7qJ$buM*exQ+iBT2lEX6pI!9sL&dwP-hzS1kDW5oGZ8rK%cvO(fyR0jCV3mFY7qJ$btM*exQ+iAT2lEX6pI#9sL&dwP)gzS1kDW5nGZ8rK%cuN(fyR0jCU3mFY7qJ$atM*exQ+hAT2lEX6pH#9sL&dwO)gzS1kDW4nGZ8rK%buN(fyR0jBU3mFY7qI!atM*exQ-hAT2lEX6oH#9sL&dvO)gzS1kDV4nGZ8rK$buN(fyR0iBU3mFY7pI!atM*exP-hAT2lEW5oH#9sL&cvO)gzS1kCV4nGZ8rJ$buN(fyR+i

10、BU3mFY6pI!atM*ewP-hAT2lDW5oH#9sL%cvO)gzS0jCV4nGZ8qJ$buN(fyQ+iBU3mFX6pI!atM*dwP-hAT2kDW5oH#9sK%cvO)gzR0jCV4nGZ7qJ$buN(exQ+iBU3mEX6pI!atL&dwP-hAT1kDW5oH#9rK%cvO)gyR0jCV4nGY7qJ$buN*exQ+iBU3lEX6pI!asL&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4nFY7qJ$buM*exQ+iBU2lEX6pI!9sL&dwP-hzS1kDW5oGZ8rK%cvO(fyR0jCV3mFY7qJ$btM*

11、exQ+iBT2lEX6pI#9sL&dwP-gzS1kDW5nGZ8rK%cvN(fyR0jCU3mFY7qJ$atM*exQ+hAT2lEX6pH#9sL&dwP)gzS1kDW4nGZ8rK%cuN(fyR0jBU3mFY7qJ!atM*exQ-hAT2lEX6oH#9sL&dvO)gzS1kDV4nGZ8rK$buN(fyR0iBU3mFY7qI!atM*exP-hAT2lEX5oH#9sL&cvO)gzS1kCV4nGZ8uN(exQ+iBU3mEX6pI!atL&dwP-hAT1kDW5oH#8rK%cvO)gyR0jCV4nGY7qJ$buN*exQ+iBU3lEX6pI!asL

12、&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4mFY7qJ$buM*exQ+iBT2lEX6pI!9sL&dwP-hzS1kDW5oGZ8rK%cvO(fyR0jCV3mFY7qJ$btM*exQ+iAT2lEX6pI#9sL&dwP)gzS1kDW5nGZ8rK%cvN(fyR0jCU3mFY7qJ$atM*exQ+hAT2lEX6pH#9sL&dwO)gzS1kDW4nGZ8rK%buN(fyR0jBU3mFY7qJ!atM*exQ-hAT2lEX6oH#9sL&dvO)gzS1kDV4nGZ8rK$buN(fyR0iBU3mFY7pI!atM*exP-hAT2lEX5o

13、H#9sL&cvO)gzS1kCV4nGZ8rJ$buN(fyR+iBU3mFY6pI!atM*ewP-hAT2lDW5oH#9sL%cvO)gzS0jCV4nGZ8qJ$buN(fyQ+iBU3mFX6pI!atM*dwP-hAT2kDW5oH#9sK%cvO)gzR0jCV4nGZ7qJ$buN(exQ+iBU3mEX6pI!atM&dwP-hAT1kDW5oH#9rK%cvO)gyR0jCV4nGY7qJ$buN*exQ+iBU3lEX6pI!asL&dwP-hAS1kDW5oH#8rK%cvO)fyR0jCV4nFY7qJ$buM*exQ+iBU2lEX6pI!9sL&dwP-hzS1

14、kDW5oGZ8rK%cvO(fyR0jCV4mFY7qJ$btM*exQ+iBT2lEX6pI#9sL&dwP-gzS1kDW5nGZ8rK%cvN(fyR0jCU3mFY7qJ$atM*exQ+hAT2lEX6pH#9sL&dwP)gzS1kDW4nGZ8rK%cuN(fyR0jBU3mFY7qJ!atM*exQ-hAT2lEX6oH#9sL&dvO)gzS1kDV4nGZ8rK%buN(fyR0iBU3mFY7qI*dwP-hAT2kDW5oH#9sK%cvO)gzR0jCV4nGZ7qJ$buN(exQ+iBU3mEX6pI!atL&dwP-hAT1kDW5oH#8rK%cvO)gyR

15、0jCV4nGY7qJ$buN*exQ+iBU3lEX6pI!asL&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4mFY7qJ$buM*exQ+iBU2lEX6pI!9sL&dwP-hzS1kDW5oGZ8rK%cvO(fyR0jCV3mFY7qJ$btM*exQ+iAT2lEX6pI#9sL&dwP-gzS1kDW5nGZ8rK%cvN(fyR0jCU3mFY7qJ$atM*exQ+hAT2lEX6pH#9sL&dwO)gzS1kDW4nGZ8rK%cuN(fyR0jBU3mFY7qJ!atM*exQ-hAT2lEX6oH#9sL&dvO)gzS1kDV4nGZ8rK$bu

16、N(fyR0iBU3mFY7pI!atM*exP-hAT2lEX5oH#9sL&cvO)gzS1kCV4nGZ8rJ$buN(fyR+iBU3mFY6pI!atM*ewP-hAT2lDW5oH#9sL%cvO)gzS1jCV4nGZ8qJ$buN(fyQ+iBU3mFX6pI!atM*dwP-hAT2kDW5oH#9sK%cvO)gzR0jCV4nGZ7qJ$buN(fxQ+iBU3mEX6pI!atM&dwP-hAT1kDZ8rK%cvO(fyR0jCV3mFY7qJ$btM*exQ+iAT2lEX6pI#9sL&dwP)gzS1kDW5nGZ8rK%cuN(fyR0jCU3mFY7qJ$a

17、tM*exQ+hAT2lEX6pH#9sL&dwO)gzS1kDW4nGZ8rK%buN(fyR0jBU3mFY7qI!atM*exQ-hAT2lEX6oH#9sL&dvO)gzS1kDV4nGZ8rK$buN(fyR0iBU3mFY7pI!atM*exP-hAT2lEW5oH#9sL&cvO)gzS1kCV4nGZ8rJ$buN(fyR+iBU3mFY6pI!atM*ewP-hAT2lDW5oH#9sL%cvO)gzS0jCV4nGZ8qJ$buN(fyQ+iBU3mFX6pI!atM*dwP-hAT2kDW5oH#9sK%cvO)gzR0jCV4nGZ7qJ$buN(exQ+iBU3mEX

18、6pI!atL&dwP-hAT1kDW5oH#9rK%cvO)gyR0jCV4nGY7qJ$buN*exQ+iBU3lEX6pI!asL&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4nFY7qJ$buM*exQ+iBU2lEX6pI!9sL&dwP-hzS1kDW5oGZ8rK%cvO(fyR0jCV3mFY7qJ$btM*exQ+iBT2lEX6pI#9sO)gzS1kCV4nGZ8rK$buN(fyR0iBU3mFY7pI!atM*exP-hAT2lEW5oH#9sL&cvO)gzS1jCV4nGZ8rJ$buN(fyQ+iBU3mFY6pI!atM*ewP-hAT2lDW5oH#9sL%cvO)gzS0jCV4nGZ8qJ$buN(fxQ+iBU3mFX6pI!atM&dwP-hAT2kDW5oH#9sK%cvO)gzR0jCV4nGZ7qJ$buN(exQ+iBU3mEX6pI!atL&dwP-hAT1kDW5oH#8rK%cvO)gyR0jCV4nGY7qJ$buN*exQ+iBU3lEX6pI!asL&dwP-hAS1kDW5oHZ8rK%cvO)fyR0jCV4mFY7qJ$buM*exQ+iBT2lEX6pI!9