Phân tích nhân tử
a) x^2 – x
b)5x^2 (x – 2y ) -15x (x-2y )
c) 3(x-y) -5x(y-x)
d) 3x(x+1)^2 – 5x^2 (x+1) +7(x+1)
Phân tích nhân tử a) x^2 – x b)5x^2 (x – 2y ) -15x (x-2y ) c) 3(x-y) -5x(y-x) d) 3x(x+1)^2 – 5x^2 (x+1) +7(x+1)
By Eden
By Eden
Phân tích nhân tử
a) x^2 – x
b)5x^2 (x – 2y ) -15x (x-2y )
c) 3(x-y) -5x(y-x)
d) 3x(x+1)^2 – 5x^2 (x+1) +7(x+1)
a) x² – x = x ( x – 1 )
b) 5x²( x – 2y ) – 15x( x – 2y ) = ( x – 2y )( 5x² – 15x )
c) 3( x – y ) – 5x( y – x ) = 3( x – y ) + 5x( x – y ) = ( x – y )( 3 – 5x )
d) 3x( x + 1 )² – 5x²( x + 1 ) + 7( x + 1 )
= 3x( x² + 2.x.1 + 1² ) – ( x + 1 )( 3x – 5x )
= 3x( x² + 2x + 1 ) – ( x + 1 )( 3x – 5x )
CHÚC BẠN HC TỐT, CHO MIK XIN CTLLHN
Đáp án:
a)x²-x
=x(x-1)
b)5x²(x-2y)-15x(x-2y)
=(x-2y)(5x²-15x²)
=5x²(x-2y)(1-3)
=5x²(x-2y)(-2)
c)3(x-y)-5x(y-x)
=3(x-y)+5x(x-y)
=(x-y)(3+5x)
d)3x(x+1)²-5x²(x+1)+7(x+1)
=(x+1)[3x(x+1)-5x²+7]
=(x+1)(3x²+3x-5x²+7)
=(x+1)(-2x²+3x+7)
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