Question

mọi người giúp mình với

Answer 1

\(10,=\left(x-3\right)\left(x+3\right)-5\left(x+3\right)=\left(x+3\right)\left(x-8\right)\\ 11,=5\left(x-y\right)-y\left(x-y\right)=\left(5-y\right)\left(x-y\right)\\ 12,=7ab^2\left(2ab-5+a\right)\\ 13,=6ab^2\left(ab-5+12a\right)\)

Answer 2

10) x²-9-5.(x+3)
= (x²-3²)-5.(x-3)
= (x+1-5).(x-3)
11) 5(x-y)+y²-xy
= 5(x-y)+(y²-xy)
= 5(x-y)+y(x-y)
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