Question

\(B=\frac{3a-b}{2a+7}+\frac{3b-a}{2b-7}vsa-b=7\left(a\ne-\frac{7}{2};b\ne\frac{7}{2}\right)\)

Answer 1

Ta có: \(a-b=7\)

\(\Rightarrow b-a=-7\)

\(B=\frac{3a-b}{2a+7}+\frac{3b-a}{2b-7}\)

\(B=\frac{2a+\left(a-b\right)}{2a+7}+\frac{2b+\left(b-a\right)}{2b-7}\)

\(B=\frac{2a+7}{2a+7}+\frac{2b-7}{2b-7}\)

\(B=1+1\)

\(B=2\)

Vậy \(B=2\)

Tham khảo nhé~

Answer 2

    \(B=\frac{3a-b}{2a+7}+\frac{3b-a}{2b-7}\)

       \(=\frac{2a+\left(a-b\right)}{2a+7}+\frac{2b-\left(a-b\right)}{2b-7}\)

       \(=\frac{2a+7}{2a+7}+\frac{2b-7}{2b-7}\) (vì a - b = 7)

       \(=1+1=2\)

Answer 3

kết quả là 1+1=2

nhớ nhé