赞 zhaojing250 幼苗
共回答了8个问题采纳率：75% 举报
y=x+2,x=y-2
x^2/9+y^2=1
x^2+9y^2=9
(y-2)^2+9y^2=9
10y^2-4y-5=0
yA+yB=4/5=2/5,yA*yB=-1/2
(yA-yB)^2=(xA-xB)^2=(yA+yB)^2-4*yA*yB=66/25
AB^2=(xA-xB)^2+(yA-yB)^2=2*66/25=132/25
|AB|=2√33/5
(yA+yB)/2=(4/10)/2=1/5
(xA+xB)/2=(1/5)-2=-9/5
AB的中点(1/5,-9/5)
x^2/9+y^2=1
x^2+9y^2=9
(y-2)^2+9y^2=9
10y^2-4y-5=0
yA+yB=4/5=2/5,yA*yB=-1/2
(yA-yB)^2=(xA-xB)^2=(yA+yB)^2-4*yA*yB=66/25
AB^2=(xA-xB)^2+(yA-yB)^2=2*66/25=132/25
|AB|=2√33/5
(yA+yB)/2=(4/10)/2=1/5
(xA+xB)/2=(1/5)-2=-9/5
AB的中点(1/5,-9/5)
1年前
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