Question

以2m,1-m的平方,1+m的平方为边的三角形是（ ）三角形?

Answer 1

(2m)^2=4m^2

[1-m^2]^2=1-2m^2+m^4

[1+m^2]^2=1+2m^2+m^4

所以(2m)^2+(1-m^2)^2=(1+m^2)^2

所以是直角三角形,但m必须0