x2-3x=1 x2-6x=-5 x2-6x 9=-5 9 (x-3) =4 x-3=±2 x1=1 x2=5 y2 3y-2=0 y2 3y 2.25=2 2.25 (y 1.5) =4.
联立方程 1.{3X+7Y=15 2X-5Y=-19 24X-3Y=0 2X+Y=10 9X+10Y=-2 6X+Y+4
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(1)y=x,y+4x=15; (2)x+2x-3y=1; (3)x-7y=0,x-9y=8=0.