Toán Lớp 8: phân tích đa thức thành nhân tử
a, x^2 + 2y
b, ( 3-2x )( 5-x ) – 2( x-5 )^2
c, ( 2x -1 )^2 – ( 3-x )( 1-2x )
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 8: phân tích đa thức thành nhân tử
a, x^2 + 2y
b, ( 3-2x )( 5-x ) – 2( x-5 )^2
c, ( 2x -1 )^2 – ( 3-x )( 1-2x )
Comments ( 2 )
x^2+2x
=x(x+2)
b, ( 3-2x )( 5-x ) – 2( x-5 )^2
=(3-2x)(5-x)-2(5-x)^2
=(5-x)[3-2x-2(5-x)]
=(5-x)(3-2x-10+2x)
=-7(5-x)
c, ( 2x -1 )^2 – ( 3-x )( 1-2x )
=(2x-1)^2+(3-x)(2x-1)
=(2x-1)(2x-1+3-x)
=(2x-1)(x+2)