要使5x+3y=4m,4x-5y=8m-3,6x-2y=9m三个方程都成立,则m=几?答案己经知道了,
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要使5x+3y=4m,4x-5y=8m-3,6x-2y=9m三个方程都成立,则m=几?答案己经知道了,
要使5x+3y=4m,4x-5y=8m-3,6x-2y=9m三个方程都成立,则m=几?答案己经知道了,
要使5x+3y=4m,4x-5y=8m-3,6x-2y=9m三个方程都成立,则m=几?答案己经知道了,
5x+3y=4m (1)
4x-5y=8m-3 (2)
6x-2y=9m (3)
(3)-(2)
2x+3y=m+3 (4)
(1)-(4)
3x=3m-3
x=m-1 代人(1)(2)
5m-5+3y=4m 3y=5-m
4m-4-5y=8m-3 5y=-4m-1
3(-4m-1)=5(5-m)
-12m-3=25-5m
-7m=28
m=-4
所以M=-4才能使三个方程成立
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