解方程-x^3/72+x^2/18-2x/9-8/3=0
问题描述:
解方程-x^3/72+x^2/18-2x/9-8/3=0
答
x³-4x²+16x+192=0x³+4x²-8x²+16x+192=0x²(x+4)-8(x²-2x-24)=0x²(x+4)-8(x+4)(x-6)=0(x+4)(x²-8x+48)=0x²-8x+48=0无解x=-4