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数学
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1.36(x-3)的二次方=49 【求x的值】 2.若x的二次方=19,则x=_____
急!
3.若a的二次方=(-7)的二次方,则a=——
人气:445 ℃ 时间:2020-04-16 03:46:05
解答
1.36(x-3)²=49
(x-3)²=49/36
x-3=±7/6
x=3±7/6
x=25/6 x=11/6
2.若x²=19,则x=±√19
3.若a²=(-7)²,则a=±7采纳啊
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