因为x1<x2<0,所以,(2x1+2)(2x2+2)=-1. 所以2x1+2<0,2x2+2>0. 因此x2-x1=[-(2x1+2)+2x2+2] ≥=1. (当且仅当-(2x1+2)=2x2+2=1,即且时等号成立) 所以,函数f(x)的图象在点A,B处的切线互相垂直时,有x2-x1≥1. (3)当x1<x2<0或x2>x1>0时,f′(x1)≠f′(x2)...
Intergrowth polytypoids as modulated structures: the example of the cation deficient oxides LaTi1-xO3 A new, essentially composition-independent structural model is proposed for the perovskite-related compound series LanTin-未O3n, with 未鈮 n/4, based on superspace formalism. In the standard 3-di...
[答案](1)o,0]u[4,+); (2)3+22-|||-2.(1)∵函数f(x的对称轴为2-m-|||-x=1=-|||-2,∴m=0,∴2+2,x≤0-|||-(0=+x-2=2.0x2-|||-2x-2,x22.由f(x)≥x+2,得龙三0-|||-2+22+2或,r0x2-|||-2≥x+2或22-|||-2-22x+2,解得x鈮?或x鈮?,故不等式f...
NO over Sn_xTi_(1-x)O_2 solid solution catalyst in the presence of CO have studied.Some important results were obtained:1 Sn_xTi_(1-x)O_2 solid solution has excellent catalytic performance for the reaction of CO-SO_2 and CO-SO_2_NO.The existence of SO_2 promotes the NO reduction...
Voltage (Note 1) V DD start voltage to ensure Power-on Reset V DD rise rate to ensure Power-on Reset Brown-out Detect Voltage Supply Current (Note 2) Standard Operating Conditions (unless otherwise stated) Operating temperature 鈥?0掳C 鈮?/div> T A 鈮?/div> +85掳C for industrial ...
宸茬煡鍑芥暟锛�1锛夊綋鏃讹紝姹備笉绛夊紡鐨勮В闆嗭紱锛�2锛夎嫢f(x)鈮�2x鐨勮В闆嗗寘鍚玔锛�1]锛屾眰鐨勫彇鍊艰寖鍥�. 相关知识点: 试题来源: 解析 见解析 解析:(1)当时,不等式可化为 ①当时,不等式为,解得,故; ②当时,不等式为,解得,故; ③当时,不等式为,解得,故...
Solid solutions of Ca 1δ Fe 2x Mn x O 4 (0.45 ≤ x ≤ 2) were synthesized from CaCl 2 as flux at 850 °C in air. The entire series, even with x = 2, crystallizes in the CaFe 2 O 4 -type structure ( Pnma ), rather than in the CaMn 2 O 4 -type structure ( Pbcm )...
①f1′(x)=3x2-(a+5),由a∈[-2,0],从而当-1<x<0时,f1′(x)=3x2-(a+5)<3-a-5≤0,所以函数f1(x)在区间(-1,0]内单调递减。 ②f2′(x)=3x2-(a+3)x+a=(3x-a)(x-1),由于a∈[-2,0],所以当0<x<1时,f2′(x)<0;当x>1时,f2′(x)>0.即函数f2(x)在区间[0,1)内...
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2019年2月,国务院印发的《国家职业教育改革实施方案》提到在职业院校、应用型本科高校启动1+X证书制度,鼓励学生在获得学历证书的同时,积极取得多类职业技能等级证书。这里的“X”证书是指( )。鳧冲经粮籩赂鸡躯铠潔鵜伞袞鎧陇备鹈銼遲鮪級讎鈮籁烫腻渔詎齡镗陧卤废栏鸲諍訥倉蔣阈。 A. 毕业证书 B. ...