已知Rt三角形ABC中,∠C=90度,AB比AC长1cm且BC=根号2+1cm,则AC=
问题描述:
已知Rt三角形ABC中,∠C=90度,AB比AC长1cm且BC=根号2+1cm,则AC=
答
设AC为X,则AB为X+1,由AB^2=AC^2+BC^2得,X^2+《(根号2)+1》^2=(X+1)^2 化简得X=(根号2)+1,即AC=(根号2)+1谢谢你,我也是这样算的,但是算不出,你能给个化简的过程吗x^2+(根号2+1)^2=x^2+2x+1x^2+2+2根号2+1=x^2+2x+12+2根号2=2xx=1+根号2