y^2=4xy^2=4x,焦点为P/2,0)故椭圆长轴在X轴上,左焦点为(-1,0)a^2-b^2=c^2 a^2=4+1=5 a=√5 故椭圆方程式为(x^2)/5+(y^2)/4=1 长轴为2√5 h-=x=)=h+x,得0=h_G+(fi)/G ,x=2,x=0和(2,-2)根据题意设抛物线方程为y^2=2px =2px则有4=2p*2 则抛物线方程为=2x...
1802.11ax 2x2 160MHz requires use of similarly configured 802.11ax wireless network routers and enables 2402Mbps maximum theoretical data rates (approx. 3X (2.8X) faster than standard 802.11ac 2x2 80MHz (867Mbps) as documented in IEEE 802.11 wireless standard specifications). 2As compared to oth...
Table 2: Intel 10th generation (Ice Lake) U Series and Y Series Processors – Performance features3,4 Feature10th Gen (Ice Lake) Intel Core U Series10th Gen (Ice Lake) Intel Core Y Series CPU/Memory/Graphics Overclocking No No Intel®Extreme Tuning Utility (XTU) ...
y=2x-3x-、选词填空 before,after, when, while, since,until,as soon as 1. ___they landed, their first winter was worse than any English winter. 2. We stayed there she arrived. 3. We have celebrated the festival the first pioneers from England arrived in America. 4.___t is all over...
To find the value of 2x2−3xy when x = -3 and y = 4, plug in -3 for x and plug in 4 for y in the expression: {eq}2x^2 - 3xy \ 2(-3)^2 -...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can...
C:y=1/2x- When we were scared,sad and helpless,you gave us courage,warmth and hopes. When we had to stay at home to keep away from the illness,you,workers,helped us buy living things;Leaving your children behind,you worked in the neighborhood every day,you never complained but smiled ...
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解:展开函数式得到2yx2+2xy+y=x2-2x-3 继而得到(2y-1)x2+(2y+2)x+(y+3)=0 将上式看作x的二次方程,y组成了方程的系数。 只有Δ>=0,x才有实值。 Δ=(2y+2)2-4(2y-1)(y+3)=-4y2-12y+16>=0 推导出(y+4)(y-1)<=0 满足条件的y在-4和1之间 下图是函数曲线,可见...绘制...
解:(1)当a=1时,y=1/ax2-2x=x2-2x=(x-1)2-1,∴二次函数的顶点坐标为(1,-1);(2)①∵y2=y3,∴B,C关于对称轴对称,∵抛物线对称轴为直线x=-(-2)/(2*1/a)=a,∴(3a+2)/2=a,∴a=-2,故答案为:-2;②由题意t=a,当3a<-1,即a<-1/3时,...