Toán Lớp 8: Kết quả phép tính 24x^5y^3z : 6x^3y^2z là:
thực hiện
a) 2x(x^2 – 3x +1)
b) (12x^3y – 9x^2y^2+ 21x^4y^3) : (3xy)
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: Kết quả phép tính 24x^5y^3z : 6x^3y^2z là:
thực hiện
a) 2x(x^2 – 3x +1)
b) (12x^3y – 9x^2y^2+ 21x^4y^3) : (3xy)
Comments ( 2 )
a)24{x^5}{y^3}z:6{x^3}{y^2}z\\
= \left( {24:6} \right)\left( {{x^5}:{x^3}} \right)\left( {{y^3}:{y^2}} \right)\left( {z:z} \right)\\
= 4{x^2}y\\
b)2x\left( {x – 3x + 1} \right)\\
= \left( {2x.{x^2}} \right) – \left( {2x.3x} \right) + \left( {2x.1} \right)\\
= 2x – 6x + 2x\\
c)\left( {12xy – 9xy + 21{x^4}y} \right):3xy\\
= \left( {12{x^3}y:3xy} \right) – \left( {9{x^2}{y^2}:3xy} \right) + \left( {21{x^4}{y^3}:3xy} \right)\\
= 4{x^2} – 3xy + 7{x^2}{y^2}
\end{array}\]