(1/2-√3/2)*1/(√3/2+1/2) 为什么等于√3-2
问题描述:
(1/2-√3/2)*1/(√3/2+1/2) 为什么等于√3-2
答
(1/2-√3/2)*1/(√3/2+1/2) =(1-√3)/2 X 1/(√3+1)/2=(1-√3)/2 X 2/(√3+1)=(1-√3)/(√3+1)=(1-√3)(√3-1)/(√3+1)(√3-1)=-(√3-1)(√3-1)/(3-1)=-(3-2√3+1)/2=(2√3-4)/2=√3-2如还不明白,请继续追问.手机提...