The fractional unit of n of M (both M and N are non-zero natural numbers) is (). He has () such units

The fractional unit of n of M (both M and N are non-zero natural numbers) is (). He has () such units

The fractional unit of n of M (both M and N are non-zero natural numbers) is (1 / M). It has (n) such units

In △ ABC, if ∠ C + a = 3 ∠ B, ∠ C - a = 80 °, then ∠ a =?, ∠ B, ∠ C =?

∠C+∠A+∠B=180° 4∠B=180° ∠B=45° ∠C=∠A+80° ∠C+∠A+∠B=2∠A+80°+∠B=180° 2∠A=55° ∠A=27.5° ∠C=107.5°

Given that positive real number ABC satisfies ABC = 1, prove a & sup2; one part + B & sup2; one part + C & sup2; one part ≥ a + B
Given that positive real number ABC satisfies ABC = 1, prove a & sup2; one part + B & sup2; one part + C & sup2; one part ≥ a + B + C

1 / 2 [(1 / A-1 / b) ^ 2 + (1 / B-1 / C) ^ 2 + (1 / C-1 / a) ^ 2] ≥ 0
1 / A ^ 2 + 1 / b ^ 2 + 1 / C ^ 2-1 / AB-1 / BC-1 / AC ≥ 0
1 / A ^ 2 + 1 / b ^ 2 + 1 / C ^ 2 ≥ 1 / AB + 1 / BC + 1 / AC
Using ABC to replace the numerator 1 on the right side of the inequality, 1 / A ^ 2 + 1 / b ^ 2 + 1 / C ^ 2 ≥ a + B + C