设a、b、c为正整数,求证:(1/a³)+(1/b³)+(1/c³)+abc≥2√3
设a,b,c为正实数,求证1/a+1/b+1/c+abc≥2√3
设a、b、c分别为三角形ABC内角A、B、C的对边,且a平方=b(b+c),求证A=2B
设a,b,c为正数求证:1/(a^3+b^3+abc)+1/(b^3+c^3+abc)+1/(a^3+c^3+abc)
不等式证明设a,b,c为正数求证:1/(a^3+b^3+abc)+1/(b^3+c^3+abc)+1/(a^3+c^3+
设a,b,c为正数,a+b+c=1,求证:①1/(a+b)+1/(b+c)+1/(a+c)≥9/2 ②(1/a-1)(1
设abc都是正实数,求证a^3+b^3+c^3≥1/3(a^2+b^2+c^2)(a+b+c)
设三角形ABC的内角A、B、C的对边长分别为abc,A=30度,(1+根3)c=2b,求C
设a,b,c都是正数,求证:1/2a+1/2b+1/2c大于等于1/(b+c)+1/(a+c)+1/(a+b)
设a,b,c都是正数,求证:1/2a+1/2b+1/2c 大于等于1/(b+c)+1/(a+c)+1/(a+b)
设a,b,c,d为正数,求证(a+c/a+b)+(b+d/b+c)+(c+a/c+d)+(d+b/d+a)≥4
设a、b、c均为正实数,求证:1/2a+1/2b+1/2c≥1/(b+c)+1/(c+a)+1/(a+b)
设啊,a,b,c均为实数,求证1/2a/2b/2c≥1/b+c +1/c+a +1/a+b