2x-3=y xy=209 求y,x
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2x-3=y xy=209 求y,x
2x-3=y xy=209 求y,x
2x-3=y xy=209 求y,x
2x-3=y xy=209 ;
(2x-3)x=209;
2x²-3x-209=0;
x=(3±41)/4;
x=11或-19/2;
y=19或-22;
2x-3=y
xy=209
x(2x-3)=209
2x^2-3x-209=0
(2x+19)(x-11)=0
x=-19/2或x=11
当x=-19/2时
y=2*(-19/2)-3=-22
当x=11时
y=2*11-3=19
所以x=-19/2,y=-22或x=11,y=19
2x-3=y xy=209
(2x-3)x=209
2x²-3x-209=0
x=(3±41)/4
x=11或-19/2
y=19或-22
2x-3=y xy=209 求y,x
x(2x-3)=209
2x2-3x-209=0
(x-11)(2x+19)=0
x=11或x=-9.5
y=19或y=-22
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