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ǰλãҳ>>"y6s>o8>>

"y6s>o8

X,YƫҪF(X,Y)= 15E ^ 3* E ^-5Y Ҳ

١߶κy=ax2+bx+c(a>0)M(-1,2)͵N(1,-2), 2=a?b+c ?2=a+b+c ,b=-2.ʸѡȷ.ڷһ:߶κy=ax2+bx+c,a>0öκͼ󿪿ϡߵM(-1,2)͵N(1,-2),ֱMNĽʽΪy-2=2?(?2) ?1?1 [x?(?1)]

κy=ax 2 +bx+c(a0)ͼͼʾ,нȷ A.a>0 B.-1<x<3ʱ,y>0 C.c<0 D.x1ʱ,yx : 0 𰸶 : ܸȤ 1ҹ

XY,ܶȷֱΪfX(x),0x1ʱ1,Ϊ0;fY(y):y>0ʱ,fY(y)=e^(-y),y0,fY(y)=0;X+Yĸܶ

:x0y'=5/(25x)>0Ϊx=0ΪСֵy=6

3T/4=/2-(-7/4),T=3,2/w=3,w=2/3,,2/3C/2+q=2+2k,kZ,q=5/3+2k,kZ,Asin(q)=-3(A>0),A=2,y=2sin(2x/3+5/3).

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