2χ²-7χ-2=0用公式法解答
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2χ²-7χ-2=0用公式法解答
2χ²-7χ-2=0用公式法解答
2χ²-7χ-2=0用公式法解答
2x²-7x-2=0
2(x²-7/2x+49/16)-49/8-2=0
2(x-7/4)²=65/8
(x-7/4)²=65/16
x-7/4=±√65/4
x=(7±√65)/4
这么简单,可是我躺着睡觉了,不是整数,还真想帮你算
2x²-7x-2=0
x=[7±√(49+4*2*2)]/2*2
=(7±√65)/4
= 3,b = 5一样,= -2
△= b的2-4ac时= 25 24 = 49 = 7 2
因此,x =(-5±7)/(2×3)
因此,1 = -2,×2 = 1/3的