2x^2+14x+49=169,求x.
人气：238 ℃ 时间：2020-04-03 10:40:24
解答
2x^2+14x+49=169
2x^2+14x-120=0
x^2+7x-60=0
(x+12)(x-5)=0
x+12=0,x-5=0
x1=-12,x2=5
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