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thaoa13thpthm1
2 năm trước
chứng minh rằng biểu thức sau không phụ thuộc vào biến ( $\frac{2ab}{a²-b²}$ + $\frac{a-b}{2a+2b}$ ) .$\frac{2a}{a+b}$ +$\frac{b}{b-a}$
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