1) 0,2ab²-1/5a²b= 0,2ab²-0,2a²b=0,2ab(b-a)
2)a³-16a=a(a²-4²)=a(a-4)(a+4)
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1) 0,2ab²-1/5a²b= 0,2ab²-0,2a²b=0,2ab(b-a)
2)a³-16a=a(a²-4²)=a(a-4)(a+4)
2) a•(a-4)(a+4)