解方程组 4x-3y-6=0 x^2+y^2-18x+45=0
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解方程组4x-3y-6=0x^2+y^2-18x+45=0解方程组4x-3y-6=0x^2+y^2-18x+45=0解方程组4x-3y-6=0x^2+y^2-18x+45=03y=4x-6;y=(4x
解方程组 4x-3y-6=0 x^2+y^2-18x+45=0
解方程组 4x-3y-6=0 x^2+y^2-18x+45=0
解方程组 4x-3y-6=0 x^2+y^2-18x+45=0
3y=4x-6;
y=(4x-6)/3;
x²+(4x-6)²/9-18x+45=0;
9x²+16x²-48x+36-162x+405=0;
25x²-210x+441=0;
(5x-21)²=0;
x=21/5;
y=18/5;
把方程式1换成:y=(4x-6)/3，代入方程式2得:(5x-21)^2=0，解得x=4.2，代入方程式1得y=3.6
由4x-3y-6=0得y^2=(4x/3-2)^2代入x^2+y^2-18x+45=0得
25x^2-210x+441=0解得x=21/5代入4x-3y-6=0得y=18/5
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