解方乘组 {XY=209 {2X-3=Y
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解方乘组 {XY=209 {2X-3=Y
解方乘组 {XY=209 {2X-3=Y
解方乘组 {XY=209 {2X-3=Y
XY=209
2X-3=Y
代入得
x(2x-3)=209
2x^2-3x-209=0
(x-11)(2x+19)=0
x=11,x=-19/2
x=11,y=19
x=-19/2,y=-22
x =11
y =19
消元解方程即可:代2式于一式既得2x2-3x-209=0,然后解一元二次方程
{XY=209 ①
{2X-3=Y②
②代入①得
X(2X-3)=209
2X²-3X-209=0
(X-11)(2X+19)=0
X=11,或X=-19/2
代入②得
{X=11,
{Y=19
或
{X=-19/2,Y=-22
解方乘组 {XY=209 {2X-3=Y
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