Question

Answer 1

\(=\dfrac{-3.7^4+7^3}{7^5.6-7^3.2}\) 

\(=\dfrac{-3.7^3.7+7^3}{7^3.7^2.6-7^3.2}\\ =\dfrac{-21.7^3+7^3}{7^3.7^2.6-7^3.2}=\dfrac{7^3\left(-21+1\right)}{7^3\left(7^2.6-2\right)}\\ =\dfrac{-20}{294-2}\\ =\dfrac{-20}{292}=\dfrac{-5}{73}\)

Answer 2

\(\dfrac{-3.7^4+7^3}{7^5.6-7^3.2}=\dfrac{7^3.7.-3+7^3}{7^3.7^2-7^3.2}=\dfrac{7^3.\left(7.-3+1\right)}{7^3.\left(7^2.6-2\right)}=\dfrac{7^3.-20}{7^3.292}=\dfrac{-20}{292}=\dfrac{-5}{73}\)