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6x+5y=36 14+8y=168

(1)6x+5y=36 x=1 y=6 (2)14x+8y=168 x=4 y=14 x=8 y=7 x=12 y=0

圆A:x²+y²-6x-8y+21=0 配方整理得 (x-3)^2+(y-4)^2+21-9-16=0 (x-3)^2+(y-4)^2=4 所以圆心A是 (3,4) (m+2)x+(2m-3)y+7-14m=0 过定点,x,y的值与m无关,则: mx+2x+2my-3y+7-14m=0 恒成立 (x+2y-14)m+2x-3y+7=0 联立 x+2y-14=0 2x...

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