3X-4Y+1=0 (1)
2X-Y+8=0 (2)
将(2)乘以-4,得-8X+4Y-32=0 (3)
(1)+(3)得 -5X=31
解得X=-31/5
将X代入(1)得Y=-22/5
若3X-4Y+=0,2X-Y+8=0求xy的值
若3X-4Y+=0,2X-Y+8=0求xy的值
若3X-4Y+1=0,2X-Y+8=0求xy的值
若3X-4Y+1=0,2X-Y+8=0求xy的值
数学人气:713 ℃时间:2020-02-03 08:27:37
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