\(3x^n.\left(6x^{n-3}+1\right)-2x^n.\left(9x^{n-3}-1\right)\)
\(=18x^{n+n-3}+3x^n-18x^{n+n-3}+2x^n\)
\(=18x^{2n-3}+3x^n-18^{2n-3}+2x^n\)
\(=3x^n+2x^n=x^n\left(3+2\right)=5x^n\)
\(3x^n\left(6x^{n-3}+1\right)-2x^n\left(9x^{n-3}-1\right)\)
a. \(3x^n\left(6x^{n-3}+1\right)-2x^n\left(9x^{n-3}-1\right)\))
thực hiện phép tính
\(3x^n\left(6x^{n-3}+1\right)-2x^n\left(9x^{n-3}-1\right)\))
\(3x^n\left\{6x^{n-3}+1\right\}-2x^n\left\{9x^{n-3}-1\right\}\)
em can giai luon nhe
Thu gọn:
\(6x^n.\left(x^2-1\right)+2x\left(3x^{n-1}+1\right)\)
Rút gọn các biểu thức sau :
a) \(6x^n\left(x^2-1\right)+2x^3\left(3x^{n+1}+1\right)\)
b) \(3x^{n-2}\left(x^{n+2}-y^{n+2}\right)+y^{n+2}\left(3x^{n-2}-y^{n-2}\right)\)
c) \(x^{n-3}\left(x-y\right)+y\left(x^{n-3}+x^{n-3}y^{n-1}\right)\)
Rút gọn
a) \(3^{10}.2^{10}-6^7.\left(6^3-1\right)\)
b) \(2x^n.\left(3x^{n+1}-1\right)-3x^{n+1}.\left(2x^n-1\right)\)
Rút gọn
a) \(\left(\frac{4}{x^3-9x}+\frac{1}{x+3}\right):\left(\frac{x-3}{x^2+3x}-\frac{x}{3x+9}\right)\)
b) \(\left(\frac{2}{x-2}-\frac{2}{x+2}\right).\frac{x^2+4x+4}{8}\)
c) \(\left(\frac{3x}{1-3x}+\frac{2x}{3x+1}\right):\frac{6x^2+10x}{1-6x+9x^2}\)
Thu gọn:
\(A=\left(3x+2\right)\left(9x^2-6x+4\right)-\left(x-3\right)\left(x+3\right)\)
