Không chắc nữa chắc sai -.-
a) \(A=\frac{3}{2}\left(-x^2y^3\right)^2\left(-x\right)^2\)
\(=\frac{3}{2}.[\left(-x\right)^{2^2}.\left(-x\right)^2].y^{3^2}\)
\(=\frac{3}{2}.\left[\left(-x\right)^4.\left(-x^2\right)\right].y^6\)
\(=\frac{3}{2}.x^6.y^6\)
b) A.B
\(\)\((\frac{3}{2}.x^6.y^6).x^6y^6\)
\(=\frac{3}{2}.\left(x^6.x^6\right).\left(y^6.y^6\right)\)
\(=\frac{3}{2}.x^{12}.y^{12}\)
A + B
\((\frac{3}{2}.x^6.y^6)+\left(x^6y^6\right)\)
\(=\frac{3}{2}.\left(x^6.x^6\right)+\left(y^6.y^6\right)\)
\(=\frac{3}{2}.x^{12}+y^{12}\)
2) P-Q
\(\left(4x^2-5xy+3x-4\right)-(y^2+4+5xy-2y+x)\)
\(=4x^2-5xy-3x-4-y^2+4x^2+5xy-2y+x\)
\(=\left(4x^2-4x^2\right)+\left(5xy-5xy\right)+\left(3x-x\right)+4-y\)
\(=2x+4-y\)
b) Không biết làm :v
