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数学
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用因式分解法解下列方程:
(1)
1
4
x
2
-9=0;
(2)(x-5)
2
=2(x-5)-1.
人气:370 ℃ 时间:2020-04-08 16:35:31
解答
(1)移项得
1
4
x
2
=9,
系数化为1得x
2
=36,
开方得x
1
=6,x
2
=-6.
(2)移项得(x-5)
2
-2(x-5)+1=0,
(x-5-1)
2
=0,
解得x
1
=x
2
=6.
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