你说的是3次根号下996吧³√996=³√(1000-4)=10(1-0.004)^(1/3)=10(1-0.004/3+(1/3)*(1/3-1)/2*0.004²+(1/3)*(1/3-1)*(1/3-2)/3!*(-0.004)³+...)=9.9866...
