Cho $\frac{1}{a}$ + $\frac{1}{b}$ + $\frac{1}{c}$ = 0
Rút gọn
A = $\frac{1}{a^2 + 2bc}$ + $\frac{1}{b^2 + 2ac}$ + $\frac{1}{c^2 + 2ab}$
B = $\frac{bc}{a^2 + 2bc}$ + $\frac{ac}{b^2 + 2ac}$ + $\frac{ab}{c^2 + 2ab}$
C = $\frac{a^2}{a^2 + 2bc}$ + $\frac{b^2}{b^2 + 2ac}$ + $\frac{c^2}{c^2 + 2ab}$
Loga
Sinh Học lớp 12
