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任何二元一次方程都可以寫成:x+by+c=0的形式 (注意:沒有a是因為如果有a,也可以把它除掉) 剩下的就是解方程組啦: 把x=1,y=1和x=2,y=-3代進去求出b,c就行了. 解得:b=1/4 c=-5/4 所以方程就是:x+ 1/4 *y - 5/4=0 寫好一點就是:4x+y=5了
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