2øϵĹϵ|x1x2|4ҳmһԪһη̣ 5һԪη̵ĸϵĹϵ
52019?ʮߣ֪xԪηx26x+2a+50ȵʵx1x2
1aȡֵΧ
2x12+x22x1x230aΪaֵ 𰸡(1) a2(2) 101
1߹xһԪηx26x+2a+50ȵʵx1x2 06242a+50 a2
2ɸϵĹϵ֪x1+x26x1x22a+5 x1x2x12+x22x1x230 ࣨx1+x223x1x230 3632a+530 a
aΪ
aֵΪ101
㾦:ҪϵĹϵбʽøбʽkȡֵΧǽĹؼע̸ⷽĶã
ʽ5-12019?绯֪xķkx23x+10ʵ
1kȡֵΧ
2÷ʵֱΪx1x2x1+x2+x1x24ʱkֵ 𰸡(1) kȡֵΧΪk(2) kֵΪ1
1k0ʱԭΪ3x+10 ãx
k0⣻
k0ʱԭΪһԪη̣ ߸һԪηʵ 324k10
ãk
kȡֵΧΪk
2x1x2Ƿkx23x+10 x1+x2
x1x2
x1+x2+x1x24
4
ãk1
飬k1Ƿʽ̵Ľ⣬ҷ⣮ kֵΪ1
㾦:˸бʽϵĹϵһԪη̵Ķ塢һԪһηԼʽ̣Ĺؼǣ1k0k0ҳkȡֵΧ2øϵĹϵx1+x2+x1x24ҳkķʽ̣ 6һԪη̵
62019?ij2016˾Ϊ20000Ԫ2018˾Ϊ24200Ԫ
12016굽2018ô˾ƽʣ
22019ô˾ǰƽͬԤ2019ô˾ǶԪ
𰸡(1) 2016굽2018ô˾ƽΪ10% (2) Ԥ2019ô˾26620Ԫ
12016굽2018ô˾ƽΪx ã200001+x224200
ãx10.110%x22.1⣬ȥ 2016굽2018ô˾ƽΪ10% 2242001+10%26620Ԫ Ԥ2019ô˾26620Ԫ
㾦:һԪη̵ӦãĹؼǣ1ϵȷгһԪη̣2ϵʽ㣮
ʽ6-12019?ݣ2016꣬ijƶļͥ˾Ϊ2500Ԫͨҵ֣չ
ֳҵ2018꣬ͥ˾ﵽ3600Ԫ
1ƶ2016굽2018ͥ˾ƽʣ
2ƽʱֲ䣬2019ƶļͥ˾Ƿܴﵽ4200Ԫ 𰸡(1) ƶ2016굽2018ͥ˾ƽΪ20% (2) 2019ƶļͥ˾ܴﵽ4200Ԫ
1ƶ2016굽2018ͥ˾ƽΪx ⣬ã25001+x23600 ãx10.220%x22.2ȥ
𣺸ƶ2016굽2018ͥ˾ƽΪ20% 236001+20%4320Ԫ 43204200
2019ƶļͥ˾ܴﵽ4200Ԫ
㾦:һԪη̵ӦãϵȷгһԪηǽĹؼ 7һԪη̵
72019?ݣͼһӲֽ壬30cm20cmĽǸȥһͬΣ
Ȼͻ𣬿Ƴһdzӣȥεı߳ȡֵʱóӵIJΪ200cm2
𰸡ȥεı߳ΪcmʱóӵIJΪ200cm2
ȥεı߳Ϊxcmdzӵĵ泤Ϊ302xcmΪ202xcmΪxcm
⣬ã2[302x+202x]x200 ã2x225x+500 ãx1
x210
x10ʱ202x0⣬ȥ
𣺵ȥεı߳ΪcmʱóӵIJΪ200cm2
㾦:һԪη̵ӦãϵȷгһԪηǽĹؼ
ʽ7-12019?Сͼʾijһ鳤AD16m
AB9mľγABCDͬС·ABƽУһADƽУಿֲݣҪʹƺֵΪ112m2С·ĿӦΪ٣
𰸡С·ĿӦΪ1m С·ĿӦΪxm ã162x9x112 ãx11x216 169
x16⣬ȥ x1
С·ĿӦΪ1m
㾦:һԪη̵ӦãŪ塰ƺܳȺܿȡǽĹؼ 8һԪη̵
82019?ӪΪӿ¾ɶת߹˾Ч棬ij˾ԽзһֵӲ
Ʒн۴ʹĵӲƷܹʱ۳г飺ֵӲƷ۵۶Ϊ200Ԫʱÿ۳300۵ÿ1Ԫÿɶ۳5֪ÿӲƷĹ̶ɱΪ100ԪֵӲƷۺ۵ΪԪʱ˾ÿɻ32000Ԫ 𰸡ֵӲƷۺ۵Ϊ180Ԫʱ˾ÿɻ32000Ԫ 轵ۺ۵ΪxԪۺÿ۳[300+5200x] ⣬ãx100[300+5200x]32000 ãx2360x+324000 ãx1x2180 180200⣮
ֵӲƷۺ۵Ϊ180Ԫʱ˾ÿɻ32000Ԫ