a) \(A=\left(4x-3\right)\left(4x+3\right)-\left(4x+1\right)^2+8x\)
\(A=16x^2-9-\left(16x^2+8x+1\right)+8x\)
\(A=16x^2-9-16x^2-8x-1+8x\)
\(A=-10\)
Vậy: ..
b) \(B=\left(x-2\right)^3-\left(12x+1\right)+x\left(6x-x^2\right)\)
\(B=x^3-6x^2+12x-8-12x-1+6x^2-x^3\)
\(B=-9\)
Vậy: ...
c) \(C=\left(x+2\right)\left(x^2-2x+4\right)-x\left(x^2+3\right)+3x\)
\(C=x^3+2^3-x^3-3x+3x\)
\(C=2^3\)
\(C=8\)
Vậy: ...
d) \(D=\left(x^2-2\right)\left(x^4+2x^2+4\right)+\left(2-x^3\right)\left(2+x^3\right)\)
\(D=\left(x^2\right)^3-2^3+2^2-\left(x^3\right)^2\)
\(D=x^6-8+4-x^6\)
\(D=-4\)
Vậy: ...
