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下列两个值中哪一个是方程 − 5 x 4 + 7 x 2 + 1 = 0 5x^4 + 7x^2 + 1=0 −5x4+7x2+1=0有解决方案吗?
下列两个值中哪一个是方程 4 x 3. + 7 x − 13 = 0 4x^3 + 7x - 13=0 4x3.+7x−13.=0有解决方案吗?
对于函数 f ( x ) = 2 x , f (x) = 2 x, f(x)=2x,下列哪项在的范围内 f f f在中间时间 [ 0 , 1 ] ? [0, 1] ? [0,1]?
f ( x ) f (x) f(x)区间上是连续函数吗 [ 25 , 40 ] 40(25日) [25,40]。如果 f ( 25 ) = 51 F (25) = 51 f(25)=51, f ( 40 ) = 13 F (40) = 13 f(40)=13., f ( 一个 ) = − 56 F (a) = - 56 f(一个)=−56在哪里 25 < 一个 < 40 25 < a < 40 25<一个<40,解的最少个数是多少 f ( x ) = 0 F (x) = 0 f(x)=0?
给定函数 f ( x ) = 24 x + 8 5 x 2 − 15 , \displaystyle{f(x)=\frac{24x+8}{5x^2 - 15}}, f(x)=5x2−1524x+8,这个方程有多少个解 f ( x ) = 0 f (x) = 0 f(x)=0在域名上 [ − 2 , 2 ] ? (2, 2) ? [−2,2]?
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