Question

tính bằng cách nhanh nhất

Answer 1

b) \(\dfrac{7256\cdot4375-725}{3650+4375\cdot7255}=\dfrac{\left(7255+1\right)\cdot4375-725}{3650+4375\cdot7255}\)

    \(=\dfrac{7255\cdot4375+4375-725}{3650+4375\cdot7255}=\dfrac{7255\cdot4375+3650}{3650+4375\cdot7255}=1\)

Answer 2

\(=\dfrac{7255\cdot4375+4375-725}{4375\cdot7255+3650}=1\)

Answer 3

\(=\dfrac{\left(7255+1\right)\cdot4375-725}{3650+4375\cdot7255}\\ =\dfrac{7255\cdot4375+1\cdot4375-725}{3650+4375\cdot7255}\\ =\dfrac{7255\cdot4375+4375-725}{3650+4375\cdot7255}\\ =\dfrac{7255\cdot4375+3560}{3650+4375\cdot7255}\\ =1\)