二次函数的实际应用(利润最值问题)附答案(2)

sand fine degrees module regularly check, overprovides module0。2 Shi, mixproportion concrete。concrete mix design, according materialcharacteristics concreterequirements, according designrequirements cement,water/cement ratio constructionrequirements, workability, slump, sand coarse aggregate size determines rate,water consumption, usingabsolute volume method sandconstruction mixture ratio。 Concrete slump control designdrawings, according minimumvalue differentparts。 According differentparts, l~4-gradedconcrete, each pouring same-gradeconcrete, according normativesample, threespecimens, standardcuring condition, measuring compressivestrength 7d,14d, 28D, testrecording, concretequality control horizontal transport mainly used concrete mixer truck transport。

Concrete delivery process should shorten transporttime; stop bleeding excessivelyreducing collapse; concrete free falling height greaterthan 2m, setting slidingtube feeding。 qualitycontrol concretepouring process, hierarchy, order, material thickness, vibrating strictly according requirements。Substandard concrete warehouses strictlyprohibited。 When pouring concrete, strictlyprohibited water。Concrete suspension the3助该超市确定绿色食品销售单价x 的范围(• 直接写出答案)． 解：设y=kx+b 由图象可知， 30 400 20 40200 1000 即一次函数表达式为1000 20 5030 100020 200001400 20 4500max （或通过配方，4500 ，也可求得最大值）答：当销售单价为35 元/千克时，每天可获得最大利润4500 44804500 204180 31x•34 或36x39． 作业布置： 1．二次函数 (只写一个)，此类函数都有_大_值(填“最大”“最小”)．3．不论自变量x 取什么实数，二次函数y=2x －6x+m的函数值总是正值二次函数利润应用，你认为m ，此时关于一元二次方程2x －6x+m=0的解的情况是_有解_(填“有解” 或“无解”) constructionmeasure rainyseason preventsettlement formworkscaffolding during construction, loose; concrete pouring rain, slump moderationdecreases, new pouring concrete plasticsheeting; heavy rain opened pouring concrete strictlyprohibited。

keepdrainage facilities clear constructionsite。 Yuqian digdrainage ditches, equipped sufficientnumber submersiblepumps waterpumps maintenance,inspection, maintenance, ensure goodcondition。 cementtemporary facilities library,material should higherthan outsideelevation featurewaterproof drainagefacilities。 rainequipment。 7。6 concrete construction quality control rawmaterials tiethan design gravel material must chemicalnature physicalproperties experiment, meet requirements rear can using, cement shipped site Hou, itsvolume security, consistency,fine degrees, do directed analysis, indexqualified rear can using; conservationwater, testmortar strength test;aggregate fineOrthopedic, aggregate,points warehouse stacked, regularly detection its containing water rate。

sand fine degrees module regularly check, overprovides module0。2 Shi, mixproportion concrete。concrete mix design, according materialcharacteristics concreterequirements, according designrequirements cement,water/cement ratio constructionrequirements, workability, slump, sand coarse aggregate size determines rate,water consumption, usingabsolute volume method sandconstruction mixture ratio。 Concrete slump control designdrawings, according minimumvalue differentparts。 According differentparts, l~4-gradedconcrete, each pouring same-gradeconcrete, according normativesample, threespecimens, standardcuring condition, measuring compressivestrength 7d,14d, 28D, testrecording, concretequality control horizontal transport mainly used concrete mixer truck transport。

1m长的可以做约三至四个蝴蝶结：）b 漂亮的珠珠——小一点的珠珠一条（如图）零售8元一串，大一点的零售10元一串，因为我总去买东西所以都按5元一串算的：）c 鱼线——和珠珠是一家买的，很早前就买了，一大圈约50米吧，3元。则该车 a．超速 c．无法判断 解析 b．不超速 d．速度刚好是 60 km/h ( )．如果以最大刹车加速度刹车， 那么由 v＝ 2ax可求得刹车时的速度为 30m/s＝108 km/h，所以该车超速行驶，a 正确． 答案 a2．(2013· 佛山一模)如图 1－2－5 所示，一小球从 a 点由静止开始沿斜面向下做匀变速直线运动，若 到达 b 点时速度为 v，到达 c 点时速度为 2v，则 xab∶xbc 等于 a．1∶1 解析 b．1∶2 ( )． d．1∶4 图 1－2－5c．1∶32 2 2 由位移－速度公式可得 vb －v2 a＝2axab，vc－vb＝2axbc，将各瞬时速度代入可知选项 c 正确． 答案 c3．(2012· 山西四校联考)以 36 km/h 的速度沿平直公路行驶的汽车，遇障碍物刹车 后获得大小为 a＝4 m/s2 的加速度，刹车后第 3 s 内，汽车走过的路程为 ( )．a．12。在第1个出口,直行进入s2075.沿s207行驶2.3公里,调头进入s2076.沿s207行驶70米,右前方转弯7.行驶4.0公里,左转8.行驶140米,右转9.行驶130米,到达终点终点:贾滩镇徐庄。