solve the equation 49-81x=0
人气：367 ℃ 时间：2020-06-11 12:00:03
解答
你的x是平方的吧?
49-81x^2=0
7^2-(9^2)x^2=0
(7+9x)(7-9x)=0
9x=-7 9x=7
x=-7/9 x=7/9
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