Question

Mng giúp mk bài 6 nha. Cảm ơn bạn nhiều 🤩

Answer 1

\(a,3a+3b-a^2-ab=3\left(a+b\right)-a\left(a+b\right)=\left(3-a\right)\left(a+b\right)\)
\(b, x^2+x+y^2-y-2xy=\left(x^2-2xy+y^2\right)+x-y=\left(x-y\right)^2+\left(x-y\right)=\left(x-y\right)\left(x-y\right)+\left(x-y\right)=\left(x-y\right)\left(x-y+1\right)\)
\(c,-x^2+7x-6=-x^2-6x-x-6=-x\left(x+6\right)-\left(x+6\right)=\left(x+6\right)\left(-x-1\right)\)

Answer 2

\(a)3a+3b-a^2-ab=3(a+b)-a(a+b)=(a+b)(3-a)\) 

mình giúp nấy thôi bai