Thực hiện các phép tính sau : \(\left(3x^{2m-1}-\frac{3}{7}y^{3n-5}+x^{2m}y^{3n}-3y^2\right)8x^{3-2m}y^{6-3n}\)
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Bài 1: Thực hiện phép tính:
A = \(\left(2x^{2n}+3x^{2n-1}\right)\left(x^{1-2n}-3x^{2-2n}\right)\)
B = \(\left(3x^{2m-1}-\frac{3}{7}y^{3n-5}+x^{2m}y^{3n}-3y^2\right).8x^{3-2m}y^{6-3n}\)
Thực hiện phép tính: ( 3x2m-1 - 3/7y3n-5 + x2my3n - 3y2 ). 8x3-2m. y6-3n
\(\left(3x^{2m-1}-\frac{3}{7}y^{3n-5}+x^{2m}y^{3n}-3y^2\right)\cdot8x^{3-2m}y^{6-3n}\)
thực hiện phép tính:a/ \(2\left(x^{2n}+2x^ny^n+y^{2n}\right)-y^n\left(4x^n+2y^n\right)\) b/ \(\left(3x^{2m-1}-\frac{3}{7}y^{3n-5}+y^{2m}y^{3n}-3y^2\right)8x^{3-2m}y^{6-3n}\)
Làm tính nhân: a. \(\left(3x^{2m-1}-\dfrac{3}{7}y^{3n-5}+x^{2m}y^{3m}-3y^2\right)8x^{3-2m}y^{6-3n}\)
b.\(\left(2x^{2n}+3x^{2n-1}\right)\left(x^{1-2n}-3x^{2-2n}\right)\)
a: \(=24x^{2m-1+3-2m}y^{6-3m}-\dfrac{24}{7}y^{3n-7+6-3n}\cdot x^{3-2m}+8x^{3-2m+2m}\cdot y^{6-3n+3m}-24x^{3-2m}y^{6-2n+2}\)
\(=24x^2y^{6-3m}-\dfrac{24}{7}x^{3-2m}\cdot y^{-1}+8x^3y^{-3n+3m+6}-24x^{3-2m}y^{-2n+8}\)
b: \(=2x^{2n+1-2n}-6x^{2n+2-2n}+3x^{2n-1+1-2n}-9x^{2n-1+2-2n}\)
\(=2x-6x^2+3-9x\)
\(=-6x^2-7x+3\)
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Thực hiện phép tính
(3x2m-1 - 7y3n-5 + x2m . y3n - 3y2).8x3-2m . y6-3n
Tính
8x3-2m.y6-3n.(3x2m-1-\(\dfrac{3}{7}\) y3n-5+ x2my3n-3y2)
\(=8x^{3-2m}\cdot y^{6-3n}\cdot3x^{2m-1}-8x^{3-2m}\cdot y^{6-3n}\cdot\dfrac{3}{7}y^{3n-5}+8x^{3-2m}\cdot y^{6-3n}\cdot x^{2m}y^{3n}-8x^{3-2m}\cdot y^{6-3n}\cdot3y^2\)
\(=24x^2y^{6-3n}-\dfrac{24}{7}x^{3-2m}\cdot y+8x^3y^6-24x^{3-2m}\cdot y^{8-3n}\)
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(3x\(^{2m-1}\) -\(\frac{3}{7}\)y\(^{3n-5}\) +x\(^{2m}\) y\(^{3n}\) -3y\(^2\) ) 8x\(^{3-2m}\) y\(^{6-3n}\)
(3x2m-1- 3/7y3n-5+x2my3n-3y2).8x3-2my