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数学
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解一元二次方程(1)(x-2)²=25 (2) (x+1)²=9 要完整的过程
人气:364 ℃ 时间:2020-05-15 05:45:37
解答
(1)(x-2)²=25
(x-2)²=5²
所以
x-2=±5
x=2+5=7
或x=2-5=-3
(2) (x+1)²=9
(x+1)²=3²
x+1=±3
所以
x=-1+3=2
或
x=-1-3=-4
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