1.X²-y²-3X+2YX+Y2.(X-2)²+(Y+3)²=93X-2Y=63.4X²-9Y²=152X-3Y=51X²-y²-3X+2Y=10.X+y=7

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1.X²-y²-3X+2YX+Y2.(X-2)²+(Y+3)²=93X-2Y=63.4X²-9Y²=152X-3Y=51X²-y&

1.X²-y²-3X+2YX+Y2.(X-2)²+(Y+3)²=93X-2Y=63.4X²-9Y²=152X-3Y=51X²-y²-3X+2Y=10.X+y=7
1.X²-y²-3X+2Y
X+Y
2.(X-2)²+(Y+3)²=9
3X-2Y=6
3.4X²-9Y²=15
2X-3Y=5
1X²-y²-3X+2Y=10
.X+y=7

1.X²-y²-3X+2YX+Y2.(X-2)²+(Y+3)²=93X-2Y=63.4X²-9Y²=152X-3Y=51X²-y²-3X+2Y=10.X+y=7
1.缺少条件
2.(X-2)²+(Y+3)²=9(1)
3X-2Y=6(2)
由(2)得:x=(6+2y)/3;带入(1)得:
4y²/9+(y+3)²=9;
4y²/9+y²+9+6y=9;
13y²/9+6y=0;
y=0,或y=-54/13;
x=2,或x=-10/13;
3.4X²-9Y²=15(1)
2X-3Y=5(2)
由(2)得:x=(5+3y)/2;带入(1)得:
4((5+3y)/2)²-9y²=15;
25+9y²+30y-9y²=15;
30y=-10;
y=-1/3;
x=2;

3: 4X²-9Y²=15
(2x+3y)(2x-3y)=15
因为2X-3Y=5
所以2x+3y=3
所以解得x=2 y=-1/3

4X²-9Y²=15
(2x+3y)(2x-3y)=15
因为2X-3Y=5
所以2x+3y=3
所以解得x=2 y=-1/3