6 tháng 8 2023 lúc 16:42
b: \(N=1-3\cdot1^2\cdot\dfrac{1}{3}x+3\cdot1\cdot\left(\dfrac{1}{3}x\right)^2-\left(\dfrac{1}{3}x\right)^3\)
\(=\left(1-\dfrac{1}{3}x\right)^3=\left(1-\dfrac{1}{3}\cdot\left(-27\right)\right)^3=\left(1+9\right)^3=10^3=1000\)
c: \(Q=\left(\dfrac{x}{y}\right)^3+3\cdot\left(\dfrac{x}{y}\right)^2\cdot2+3\cdot\dfrac{x}{y}\cdot2^2+2^3\)
=(x/y+2)^3
=(36/2+2)^3
=20^3
=8000
Đúng 0
Bình luận (0)
