a²+4*a=25697,a等于多少?
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a²+4*a=25697,a等于多少?
a²+4*a=25697,a等于多少?
a²+4*a=25697,a等于多少?
a²+4*a=25697
a²+4a+4=25697+4
(a+2)²=25701
a+2=±√(25701)
a=-2±√(25701)
a有两个
a1≈-2+160.3153=158.3153
a2≈-2-160.3153=162.3153