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

9x+5y=4614.9x+2y=624x+3y=3615.9x+4y=467x+4y=4216.9x+7y=1354x+...6x+3y=4227.8x+2y=167x+y=1128.4x+9y=778x+6y=9429.6x+8y=687x+6y...

lll

5x+8y=44 11.7x+5y=54 3x+4y=38 12.x+8y=...9x+5y=46 14.9x+2y=62 4x+3y=36 15.9x+4y=...4.已知不等式5x-2

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...

9x+5y=46 14.9x+2y=62 4x+3y=36 15.9x+4y=46 7x+4y=42 16.9x+7y=...29.6x+8y=68 7x+6y=66 30.2x+2y=22 7x+2y=47 展开剩余84% 0 4 ...

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