设f(x)=-5x^3+2x+1 零点区间为A[0,1] B[1,2] C[-2,-1] D[-1,0]

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设f(x)=-5x^3+2x+1 零点区间为A[0,1] B[1,2] C[-2,-1] D[-1,0]
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设f(x)=-5x^3+2x+1 零点区间为A[0,1] B[1,2] C[-2,-1] D[-1,0]
设f(x)=-5x^3+2x+1 零点区间为
A[0,1] B[1,2] C[-2,-1] D[-1,0]

设f(x)=-5x^3+2x+1 零点区间为A[0,1] B[1,2] C[-2,-1] D[-1,0]
A,把区间的两个端点代进去,算出来是一正一负就对了