Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
( 2x + 3 )( 4x2 - 6x + 9 ) - 2( 4x3 - 1 )
= ( 2x )3 + 33 - 8x3 + 2
= 8x3 + 27 - 8x3 + 2
= 29
[2x+3][4x2L- 6X+9L] - 2L[4x3l -1]
=[2xl]3l + 3l3 - 8x3l +2
=8x3l+27-8x3l +2
= 29ll= 29l = 29
( 4x - 1 )3 - ( 4x - 3 )( 16x2 + 3 )
= ( 4x )3 - 3.( 4x )2.1 + 3.4x.12 - 13 - ( 64x3 + 12x - 48x2 - 9 )
= 64x3 - 48x2 + 12x - 1 - 64x3 - 12x + 48x2 + 9
= ( 64x3 - 64x3 ) + ( 48x2 - 48x2 ) + ( 12x - 12x ) + ( 9 - 1 )
= 8
\(A=\frac{x}{x-1}+\frac{3}{x+1}-\frac{5x}{x^2-1}\)
\(=\frac{x\left(x+1\right)}{\left(x-1\right)\left(x+1\right)}+\frac{3\left(x-1\right)}{\left(x-1\right)\left(x+1\right)}-\frac{5x}{\left(x-1\right)\left(x+1\right)}\)
\(=\frac{x^2+x}{\left(x-1\right)\left(x+1\right)}+\frac{3x-3}{\left(x-1\right)\left(x+1\right)}-\frac{5x}{\left(x-1\right)\left(x+1\right)}\)
\(=\frac{x^2+x+3x-3-5x}{\left(x-1\right)\left(x+1\right)}=\frac{x^2-x-3}{\left(x-1\right)\left(x+1\right)}\)