作业帮X+Y=50 XY=616 求XY
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X+Y=50 XY=616 求XY
X+Y=50 XY=616 求XY
X+Y=50 XY=616 求XY
X+Y=50
y=50-x
x(50-x)=616
x²-50x+616=0
（x-22）(x-28)=0
x1=22 x2=28
y1=28 y2=22
X+Y=50 (1)
XY=616 (2)
由（1）得 x=50-y (3)
(3)代入（2）得
y(50-y)=616
y²-50y+616=0
y1=28, y2=22
分别代入（3）得
x1=22, x2=28
∴原方程组的解是﹛x=22,y=28或﹛x=28,y=22
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