解方程x的平方减2ax减3a方=0
人气:221 ℃ 时间:2020-04-03 05:55:49
解答
配方法:
x的平方减2ax减3a方=0
x的平方-2ax+a的平方-a的平方-3a方=0
(x-a)的平方-4a的平方=0
(x-a)的平方=4a的平方
x-a=±2a
x1=a+2a=3a
x2=a-2a=-a
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