2x-3=y xy=209
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2x-3=yxy=2092x-3=yxy=2092x-3=yxy=2092x-3=yxy=209;(2x-3)x=209;2x²-3x-209=0;x=(3±41)/4;x=11或-19/2
2x-3=y xy=209
2x-3=y xy=209
2x-3=y xy=209
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;
这样可以么?
y=2x-3;
x(2x-3)=209;
2x*x-3x=209;
求出x,进而求出y;
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