根号32-根号8+2根号2分之一2x²-4x-1=0
问题描述:
根号32-根号8+2根号2分之一
2x²-4x-1=0
答
根号32=4根号2 根号8=2根号2 根号(1/2)=1/2根号2
则原式=(4-2+2*(1/2))根号2=3根号2
2x²-4x-1=0根据Δ=b²-4ac=4²-4*2*(-1)=24>0
x=(-b±根号Δ)/2a
x=(4±2√6)/4=1±√6/2
答
=4根号2-2根号2+根号2=3根号2
x=(4±根号24)/4==(2±根号6)/2
答
根号32=根号(4²*2)=4根号2根号8=根号(2²*2)=2根号22根号1/2=2*(根号2)/2=根号2原式=4根号2-2根号2+根号2=3根号22x²-4x-1=02(x²-2x-1/2)=02(x²-2x+1)=3(x-1)²=3/2x-1=±(根...