设A={(x,y)|3x+2y=1} B={(x,y)|x-y=2}
3个回答
解 A交B,两个方程组解相等
3x+2y=1 ①
x-y=2 ②
②×2得:2x-2y=4 ③
①+③得:5x=5
解得:x=1
y=-1
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