Toán Lớp 8: 1) x(2x+y)+(-16x-9y)
2) 9x(x+y)+3(y+x)^2
3) (3x-1)^2-(3x-1).5 ( làm giúp em theo cách phân tích thành nhân tử )
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: 1) x(2x+y)+(-16x-9y)
2) 9x(x+y)+3(y+x)^2
3) (3x-1)^2-(3x-1).5 ( làm giúp em theo cách phân tích thành nhân tử )
Comments ( 1 )
b)9x\left( {x + y} \right) + 3{\left( {y + x} \right)^2}\\
= 3.\left( {x + y} \right).\left( {3x + x + y} \right)\\
= 3.\left( {x + y} \right).\left( {4x + y} \right)\\
c){\left( {3x – 1} \right)^2} – \left( {3x – 1} \right).5\\
= \left( {3x – 1} \right).\left( {3x – 1 – 5} \right)\\
= \left( {3x – 1} \right).\left( {3x – 6} \right)\\
= 3.\left( {3x – 1} \right).\left( {x – 2} \right)
\end{array}$