若方程组ax+by=2和ax-by=2与2x+3y=4和4x-5y=-6的解相同,求（a+b）
人气：478 ℃ 时间：2019-08-21 04:18:28
解答
解方程组：2x+3y=4,4x-5y=-6
得 x = 1/11,y = 14/11
代入另一组方程组,得
a/11+14b/11 =2,a/11 -14b/11 =2
解之,得 a=11,b=14
所以 a+b = 25好像是22.���ǶԵģ��������a/11+14b/11 =2, a/11 -14b/11 =2��֮���� a=22, b=0���� a+b = 22��Ǹ
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