Toán Lớp 8: Thực hiện phép tính
a. (2x + 3).(x – 2)
b. (12x2y2 – 8x3y2 + 10xy) : 2xy
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: Thực hiện phép tính
a. (2x + 3).(x – 2)
b. (12x2y2 – 8x3y2 + 10xy) : 2xy
Comments ( 2 )
$= 2x^2 – 4x + 3x – 6$
$= 2x^2 – x – 6$
$b) (12x^2y^2 – 8x^3y^2 + 10xy) : 2xy$
$= [(12:2).(x^2y^2:xy)].[(-8:2).(x^3y^2:xy)].[(10:2).(xy:xy)]$
$= 6xy – 4x^2y + 5$
$= – 4x^2y + 6xy + 5$