Question

已知三角形的三边长分别为X的平方加上X加1,X的平方减1,2X加1（X>1）.求最大角.

Answer 1

cos(c)=(a²+b²-c²)/(2ab)=((x²-1)²+(2x+1)²-(x²+x+1)²)/(2*(x²-1)+(2x+1))化解后cos(c)=(-2x³-x²+2x-1)/(4x³+2x²-4x-2)当x→∞时有最大角,cos(c)...