x-y+3=0,7x+5y=9 方程组怎么用加减消元法求解?
人气：358 ℃ 时间：2019-10-10 06:15:09
解答
x-y+3=0(1)
7x+5y=9 (2)
(1)*5+（2）得：
12x+15=9
x=-1/2
代入（1）得：
y=-1/2+3=5/2
所以,方程组的解是：x=-1/2；y=5/2
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